Beginning of pregnancy controversy#Definitions of pregnancy beginning
{{short description|Cultural-linguistic, not scientific question}}
{{use dmy dates|date=May 2024}}
File:Sperm-egg.jpg, begins at the exact moment that sperm and egg interact is highly controversial, although it is commonly held by groups such as the Roman Catholic Church and many traditionally religious individuals, and other alternate viewpoints are put forth.]]
Controversy over the beginning of pregnancy occurs in different contexts, particularly as it is discussed within the debate of abortion in the United States. Because an abortion is defined as ending an established pregnancy, rather than as destroying a fertilized egg, depending on when pregnancy is considered to begin, some methods of birth control as well as some methods of infertility treatment might be classified as causing abortions.
The controversy is not primarily a scientific issue, since knowledge of human reproduction and development has become very refined; the linguistic questions remain debated for other reasons. The issue poses larger social, legal, medical, religious, philosophical, and political ramifications because some people, such as Concerned Women for America, identify the beginning of a pregnancy as the beginning of an individual human being's life.[https://www.guttmacher.org/gpr/2005/05/implications-defining-when-woman-pregnant "The Implications of Defining When a Woman Is Pregnant"]. The Guttmacher Report on Public Policy. May 2005, Volume 8, Number 2. Many of these arguments are related to the anti-abortion movement. In this way of thinking, if the pregnancy has not yet begun, then stopping the process is not abortion and therefore can contain none of the moral issues associated with abortion, but if it is a pregnancy, then stopping it is a morally significant act.
A major complication is that ideological and religious concepts such as "ensoulment" (whether or not a human being is said to have gone from mere matter to having a spiritual entity inside) and "personhood" (whether or not a human being is said to be a distinct individual with innate human rights versus otherwise) exist outside of scientific analysis, and thus many individuals have argued that the beginning of pregnancy cannot be determined strictly through physical evidence alone. No experiment exists (or can exist) to measure the spirituality of an object or living thing in the same way that height, temperature, weight, etc. can be studied.
Generally speaking, some ideological and religious commentaries have argued that pregnancy should be stated as beginning at the first, exact moment of conception in which a human sperm makes full contact with an egg cell. In contrast, other commentaries have argued that the duration of pregnancy begins at some other point, such as when the fertilization process ends (when a new, independent cell genetically distinct from the prior egg and sperm exists) or when implantation occurs (when the new set of cells lodges itself against the uterine wall, allowing it to grow rapidly). The ambiguity's implications mean that, despite the scientific community being able to describe the physical processes in detail, the decision about what should be called "abortion" and what should be called "contraception" or pregnancy prevention are not agreed upon.
Definitions of pregnancy beginning
Traditionally, doctors have measured pregnancy from a number of convenient points, including the day of last menstruation, ovulation, fertilization, implantation and chemical detection.{{Citation |last=Betz |first=Danielle |title=Human Chorionic Gonadotropin |date=2024 |work=StatPearls |url=https://www.ncbi.nlm.nih.gov/books/NBK532950/ |access-date=2024-10-10 |place=Treasure Island (FL) |publisher=StatPearls Publishing |pmid=30422545 |last2=Fane |first2=Kathleen}} This has led to some confusion about the precise length of human pregnancy, as each measuring point yields a different figure.
At its 2004 Annual Meeting, The American Medical Association passed a resolution in favor of making "Plan B" emergency contraception available over-the-counter, and one of the claims in the resolution was that hormonal contraception that may affect implantation "cannot terminate an established pregnancy."[http://www.ama-assn.org/ama1/pub/upload/mm/15/res_hod443_a04.doc FDA Rejection of Over-The-Counter Status for Emergency Contraception Pills] American Medical Association House of Delegates Resolution:443. Retrieved April 30, 2007 Similarly, the British Medical Association has defined an "established pregnancy" as beginning at implantation.{{cite web | author=BMA | author-link=British Medical Association | title=Abortion time limits: A briefing paper from the British Medical Association | date=May 2005 | url=http://www.bma.org.uk/ap.nsf/Content/AbortionTimeLimits | access-date=2006-07-31 | archive-url=https://web.archive.org/web/20060827050344/http://www.bma.org.uk/ap.nsf/Content/AbortionTimeLimits | archive-date=2006-08-27 | url-status=dead }} "The term 'abortion' is used throughout this paper to refer to the induced termination of an established pregnancy (i.e. after implantation)." The legal definition in the United Kingdom is not clear.{{cite web |author1=Hope, T. |author2=Savulsecu, J. |name-list-style=amp | url=http://www.ethox.org.uk/education/teach/pregnancy/pregnancy3.htm | title =Handout 3: Outline of Legal Positions in England and Wales | work =Medical Ethics and Law Teaching Materials: Termination of Pregnancy | pages =Appendix 3: Some key points in the law on abortion and fetal damage | publisher =The Oxford Centre for Ethics and Communication in Health Care Practice, Oxford University |archive-url = https://web.archive.org/web/20060323042032/http://www.ethox.org.uk/education/teach/pregnancy/pregnancy3.htm |archive-date = 2006-03-23}} – "It is generally assumed that when the Act states that 'pregnancy has not exceeded its 24th week' it means 24 weeks since the first day of the woman's last period. But this is not clear – particularly if there is evidence that conception had taken place on a day after this....The Attorney General said, in 1983 (see Brazier 1992 page 293-4) that there is no pregnancy until implantation. This is persuasive but not binding precedence." {{cite web | url = http://www.pdf-archive.com/2012/05/29/termination-of-pregnancy-handout/termination-of-pregnancy-handout.pdf | title = Termination of Pregnancy Handout (pdf) }}
Other definitions exist. The American Heritage Stedman's Medical Dictionary defines "pregnancy" as "from conception until birth."The American Heritage Stedman's Medical Dictionary, 2002 Definitions like this may add to a lay person's confusion, as "conception" in a scientific context may be defined as fertilization,{{cite book|last=Hellweg|first=Paul|title=The American Heritage Science Dictionary|year=2011|publisher=Houghton Mifflin Harcourt Publishing Company|isbn=9780547470924|page=137|url=http://www.hmhco.com/shop/books/the-american-heritage-science-dictionary/9780547470924|access-date=2013-10-06|archive-url=https://web.archive.org/web/20130622234734/http://www.hmhco.com/shop/books/the-american-heritage-science-dictionary/9780547470924|archive-date=2013-06-22|url-status=dead}}{{cite book|last=Martin|first=Elizabeth A.|title=A Dictionary of Science|url=https://archive.org/details/dictionaryscienc00libg|url-access=limited|year=2012|publisher=Oxford University Press|isbn=978-0199561469|page=[https://archive.org/details/dictionaryscienc00libg/page/n190 185]}} in a medical context can mean either fertilization{{cite book|last=Mosby|title=Mosby's Medical Dictionary|year=2012|publisher=Elsevier Health Sciences|isbn=978-0323085410|page=415}}{{cite book|last=Dorland|title=Dorland's Illustrated Medical Dictionary|year=2011|publisher=Saunders|isbn=978-1416062578|page=355}} or implantation{{cite web | url=http://www.acog.org/~/media/Committee%20Opinions/Committee%20on%20Ethics/co360.pdf | title=Sex Selection | publisher=ACOG | date=February 2007 | archive-url=https://web.archive.org/web/20150610232320/http://www.acog.org/~/media/Committee%20Opinions/Committee%20on%20Ethics/co360.pdf | archive-date=June 10, 2015 | number=360}} but in lay terms may mean both.{{cite encyclopedia|title=Conception|encyclopedia=Merriam-Webster|date=5 February 2024 |url=http://www.merriam-webster.com/dictionary/conception}}
Whether conception refers to fertilization or implantation would seemingly even impact "established pregnancies" such as an ectopic pregnancy. If conception is defined as at implantation, ectopic pregnancies could not be called pregnancies. However, some medical professionals who oppose birth control,{{cite web|last=Larimore|first=Walter|title=Ethical Issues Regarding Hormonal Contraceptives|url=http://www.christianfamilyplanning.org/hormonal.php|work=The Truth About Birth Control|access-date=14 March 2011}} such as Walter Larimore of the Focus on the Family group, have argued that the medical definition of conception should include fertilization.{{cite journal|author=Larimore, Walter L|display-authors=etal|url=http://www.stfm.org/fmhub/fm2004/November/Walter690.pdf|title=Response: Does Pregnancy Begin at Fertilization?|journal=Family Medicine|year=2004}}
Finally, the standard historical method of counting the duration of pregnancy begins from the last menstruation and this remains common with doctors, hospitals, and medical companies.Doctor:{{cite web
|author=George P. Pettit, M.D.
|title=Due Date Calculator
|year=2002
|url=http://www.drpettit.com/ddcalc.html
}}
Hospital:{{cite web
|author=Northwestern Memorial Hospital
|title=What is a trimester?
|year=2006
|url=http://www.nmh.org/nmh/adam/pregnancy/000006.htm
|url-status=dead
|archive-url=https://web.archive.org/web/20051104004351/http://www.nmh.org/nmh/adam/pregnancy/000006.htm
|archive-date=2005-11-04
}}
Medical company:{{cite web
|author=The Merck Manuals Online Medical Library
|title=Stages of Development: Pregnancy
|year=2003
|url=http://www.merck.com/mmhe/sec22/ch257/ch257c.html
}} This system is convenient because it is easy to determine when the last menstrual period was, while both fertilization and implantation occur out of sight. An interesting consequence is that the dating of pregnancy measured this way begins two weeks before ovulation.
Although many anti-abortion advocates have argued that both pregnancy and status of a separate human life beginning happen at fertilization, several examples also exist of people within those movements taking alternate views. For example, doctor and social activist Bernard Nathanson wrote in his 1979 work Aborting America that a confirmed moment of implantation should be considered the point at which a distinct human being exists. He specifically stated (note that 'alpha' is his shorthand for an organized group of cells), "Biochemically, this is when alpha announces its presence as part of the human community by means of its hormonal messages, which we now have the technology to receive... know[ing] biochemically that it is an independent organism distinct from the mother."{{cite book|last1=Nathanson|first1=Bernard N.|author-link=Bernard Nathanson|date=1979|title=Aborting America|pages=216|first2=Richard N.|last2=Ostling|publisher=Life Cycle Books|isbn=9780919225008}}
Legal implications
In August 2008, the U.S. Department of Health and Human Services proposed a regulation to protect certain actions of health workers: refusal to provide patient services that the health workers believe to be abortifacient. The ban on discrimination against these employees would apply to all organizations that receive grant money from HHS. A draft version leaked in July proposed that the U.S. federal government define abortion as including "termination of [human] life... before... implantation." The official proposal dropped the definition of abortion, instead leaving it to the objecting individual to define abortion for him- or herself. Groups on both sides of the controversy believe the ban is intended to allow health workers to refuse to dispense IUDs and hormonal contraceptives, including emergency contraception. It has drawn widespread criticism from major medical and health groups.{{cite news | last = Stein | first = Rob | title = Workers' Religious Freedom vs. Patients' Rights | newspaper = Washington Post | pages = A01 | date = 2008-07-31 | url = https://www.washingtonpost.com/wp-dyn/content/article/2008/07/30/AR2008073003238.html | access-date = 2008-08-05}}{{cite news | last = Shapiro | first = Joseph | title = HHS Backs Protections For Anti-Abortion Doctors | newspaper = Washington Post | date = 2008-08-22 | url = https://www.npr.org/templates/story/story.php?storyId=93848623 | access-date = 2008-08-24}}{{cite news | last = Stein | first = Rob | title = Protections Set for Antiabortion Health Workers | newspaper = Washington Post | pages = A01 | date = 2008-08-22 |url=https://www.washingtonpost.com/wp-dyn/content/story/2008/08/21/ST2008082103218.html |access-date=2008-08-24}}
History
In the past, pregnancy has been defined in terms of conception. For example, Webster's Dictionary defined "pregnant" (or "pregnancy") as "having conceived" (or "the state of a female who has conceived"), in its 1828 and 1913 editions.[http://machaut.uchicago.edu/websters Webster’s Revised Unabridged Dictionary] {{webarchive|url=https://archive.today/20120710101105/http://machaut.uchicago.edu/websters |date=2012-07-10 }} (1913 and 1828) via the ARTFL Project. See definitions of "pregnant" and "pregnancy". However, in the absence of an accurate understanding of human development, early notions about the timing and process of conception were often vague.
Both the 1828 and 1913 editions of Webster's Dictionary said that to "conceive" meant "to receive into the womb and ... begin the formation of the embryo." However most references say that it was only in 1875 that Oskar Hertwig discovered that fertilization includes the penetration of a spermatozoon into an ovum. Thus, the term "conception" was in use long before the details of fertilization were discovered. By 1966, a more precise meaning of the word "conception" could be found in common-use dictionaries: the formation of a viable zygote.Webster’s Third New International Dictionary (1966), defining conception as the "act of becoming pregnant (formation of a viable zygote); state of being conceived; that which is conceived (embryo, fetus)..." quoted in Mallett Shelley, [http://www.press.umich.edu/titleDetailLookInside.do?id=23496 Conceiving Cultures] {{Webarchive|url=https://web.archive.org/web/20060830024208/http://www.press.umich.edu/titleDetailLookInside.do?id=23496 |date=2006-08-30 }}, p. 284 (U. Mich. 2003).
In 1959, Dr. Bent Boving suggested that the word "conception" should be associated with the process of implantation instead of fertilization.Boving, B.G., "Implantation Mechanisms", in Mechanics Concerned With Conception. Hartman, C.G., ed. (Pergamon Press 1963), page 386. Some thought was given to possible societal consequences, as evidenced by Boving's statement that "the social advantage of being considered to prevent conception rather than to destroy an established pregnancy could depend on something so simple as a prudent habit of speech." In 1965, the American College of Obstetricians and Gynecologists (ACOG) adopted Boving's definition: "conception is the implantation of a fertilized ovum."American College of Obstetricians and Gynecologists Terminology Bulletin. Terms Used in Reference to the Fetus. No. 1. Philadelphia: Davis, September, 1965.
The 1965 ACOG definition was imprecise because, by the time it implants, the embryo is called a blastocyst,Biggers, J., "Ambiguity of the Word Conception: Implications if S. 158 is Enacted", [https://books.google.com/books?id=LmkTAAAAIAAJ&q=%22Human+Life+Bill%22+and+biggers The Human Life Bill Appendix, Hearings Before the Subcommittee on Separation of Powers of the Committee on the Judiciary, United States Senate], p. 281-288 (1982). so it was clarified in 1972 to "Conception is the implantation of the blastocyst."Hughes, E.C. "Gametogenesis and Fertilization", in Obstretric-Gynecologic Terminology. Philadelphia: Davis, 1972: 299–304. Some dictionaries continue to use the definition of conception as the formation of a viable zygote.[http://dictionary.reference.com/browse/conception Dictionary.com].
Birth control – mechanism of action
{{see also|Combined oral contraceptive pill#Mechanism of action}}
Birth control methods usually prevent fertilization.{{cite web |title=Birth Control Options |url=https://my.clevelandclinic.org/health/articles/11427-birth-control-options |website=my.clevelandclinic.org |publisher=Cleveland Clinic |access-date=14 July 2023}} This cannot be seen as abortifacient{{cite journal |last1=Glasier |first1=Anna |title=Emergency Postcoital Contraception |journal=New England Journal of Medicine |date=October 9, 1997 |volume=337 |issue=15 |pages=1058–1064 |doi=10.1056/NEJM199710093371507 |pmid=9321535 |url=https://www.nejm.org/doi/10.1056/NEJM199710093371507 |quote=Any device or drug that acts after implantation is conventionally regarded as an abortifacient rather than a contraceptive.}} because, by any of the above definitions, pregnancy has not started.{{cite web |last1=Attia |title=Do I Need Emergency Contraception or the Abortion Pill? |url=https://www.plannedparenthood.org/blog/do-i-need-emergency-contraception-or-the-abortion-pill |website=plannedparenthood.org |access-date=14 July 2023 |date=May 12, 2023}} However, emergency contraception might have a secondary effect of preventing implantation, thus allowing the embryo to die.{{cite journal |last1=Kahlenborn |first1=Chris |title=Postfertilization Effect of Hormonal Emergency Contraception |journal=Annals of Pharmacotherapy |date=2002 |volume=36 |issue=3 |pages=465–470 |doi=10.1345/aph.1A344|pmid=11895061 |s2cid=36847373 }}{{cite journal |last1=Mozzanega |first1=Bruno |title=How do levonorgestrel-only emergency contraceptive pills prevent pregnancy? Some considerations |journal=Gynecological Endocrinology |date=2011 |volume=27 |issue=6 |pages=439–442 |doi=10.3109/09513590.2010.501885|pmid=20670097 |s2cid=6431709 }}{{cite journal |author1=Rebecca Peck |author2=Walter Rella |author3=Julio Tudela |author4=Justo Aznar |author5=Bruno Mozzanega |title=Does levonorgestrel emergency contraceptive have a post-fertilization effect? A review of its mechanism of action |journal=Linacre Q |date=February 2016 |volume=83 |issue=1 |pages=35–51 |doi=10.1179/2050854915Y.0000000011 |pmid=27833181 |quote=Plan B is the most widely used emergency contraceptive available. It is important for patients and physicians to clearly understand the drug’s mechanism of action (MOA)... data suggest that when administered pre-ovulation, it may have a post-fertilization MOA.|pmc=5102184 }} Those who define pregnancy from fertilization subsequently may conclude that the agents should be considered abortifacients.{{cite web |last1=DeSanctis |first1=Alexandra |title=Yes, Some Contraceptives Are Abortifacients |url=https://www.nationalreview.com/2016/11/contraception-birth-control-abortion-abortifacients-ella-plan-b-iud-embryo-life/ |website=nationalreview.com |publisher=National Review |date=November 4, 2016}}
Speculation about post-fertilization mechanisms is widespread, even appearing on patient information inserts for hormonal contraception, but there is no clinical support. One small study, using fourteen women, might be considered as providing evidence of such an effect for IUDs{{cite journal |vauthors=Stanford J, Mikolajczyk R | title = Mechanisms of action of intrauterine devices: update and estimation of postfertilization effects | journal = Am J Obstet Gynecol | volume = 187 |issue=6 |pages=1699–708 |year=2002 |pmid = 12501086 | doi = 10.1067/mob.2002.128091}}, which cites:
:{{cite journal |vauthors=Smart Y, Fraser I, Clancy R, Roberts T, Cripps A | title = Early pregnancy factor as a monitor for fertilization in women wearing intrauterine devices |journal = Fertil Steril | volume = 37 |issue = 2 | pages = 201–4 | year = 1982 | pmid = 6174375 | doi=10.1016/S0015-0282(16)46039-5| doi-access = free }} and a study of the combined oral contraceptive pill has been proposed.{{cite journal |author=Lloyd J DuPlantis, Jr | title = Early Pregnancy Factor | publisher = Pharmacists for Life, Intl | year = 2001 | url = http://www.lifeissues.net/writers/dup/dup_01earlypregfacts.html | access-date = 2007-01-01 }}
=Possibly affected methods=
- Hormonal contraception, including emergency contraception, are known to be effective at preventing ovulation. Some scientists believe hormonal methods may have a secondary effect of interfering with implantation of embryos.{{Citation needed|date=March 2011}}
- Intrauterine devices (IUDs) have been proven to have strong spermicidal and ovicidal effects;{{cite web |title=Mechanisms of the Contraceptive Action of Hormonal Methods and Intrauterine Devices (IUDs) |work=Family Health International |year=2006 |url=http://www.fhi.org/en/RH/Pubs/booksReports/methodaction.htm |access-date=2006-07-05 | archive-url= https://web.archive.org/web/20060617090044/http://www.fhi.org/en/RH/Pubs/booksReports/methodaction.htm| archive-date= 17 June 2006 | url-status= live}}{{cite web |last=Keller |first=Sarah |title=IUDs Block Fertilization |work=Network |publisher=Family Health International |date=Winter 1996|volume=16|issue=2 |url=http://www.fhi.org/en/RH/Pubs/Network/v16_2/nt1623.htm |access-date=2006-07-05 | archive-url= https://web.archive.org/web/20060623084627/http://www.fhi.org/en/RH/Pubs/Network/v16_2/nt1623.htm| archive-date= 23 June 2006 | url-status= live}} the current medical consensus is that this is the only way in which they work.{{cite book |author=Grimes, David |year=2007 |chapter=Intrauterine Devices (IUDs) |editor=Hatcher, Robert A. |title=Contraceptive Technology |edition=19th rev. |location=New York |publisher=Ardent Media |isbn=978-0-9664902-0-6 |page=[https://archive.org/details/contraceptivetec00hatc/page/120 120] |display-editors=etal |chapter-url-access=registration |chapter-url=https://archive.org/details/contraceptivetec00hatc/page/120 }} Still, a few physicians have suggested they may have a secondary effect of interfering with the development of pre-implanted embryos; this secondary effect is considered more plausible when the IUD is used as emergency contraception.{{cite journal |first=James |last=Trussell |author2=Elizabeth G. Raymond |title=Emergency Contraception: A Last Chance to Prevent Unintended Pregnancy |publisher=The Office of Population Research at Princeton University and the Association of Reproductive Health Professionals |date=September 2010 |url=http://ec.princeton.edu/questions/ec-review.pdf |access-date=2010-10-27| archive-url= https://web.archive.org/web/20100923040101/http://ec.princeton.edu/questions/ec-review.pdf| archive-date= 23 September 2010 | url-status= live}}
- The lactational amenorrhea method works primarily by preventing ovulation, but is also known to cause luteal phase defect (LPD). LPD is believed to interfere with the implantation of embryos.{{cite journal |vauthors=Díaz S, Cárdenas H, Brandeis A, Miranda P, Salvatierra A, Croxatto H | title = Relative contributions of anovulation and luteal phase defect to the reduced pregnancy rate of breastfeeding women | journal = Fertil Steril | volume = 58 | issue = 3 | pages = 498–503 | year = 1992 | doi = 10.1016/S0015-0282(16)55251-0 | pmid = 1521642}}
- Natural Family Planning (NFP) methods are intended to prevent fertilization through avoiding intercourse during fertile periods. {{anchor|Rhythm method and embryonic death}}Luc Bovens argues that, under an assumption that the age of gametes has an effect on embryo viability, errors in NFP method result in the occurrence of lower-viability embryos. This is intended to be an ethical thought experiment; Bovens states that his assumption "is not backed up by empirical evidence, but does have a certain plausibility."{{cite journal | author=Luc Bovens | title=The rhythm method and embryonic death | journal=Journal of Medical Ethics | year=2006 |volume=32 | pages=355–356 | url= | pmid=16731736 |doi=10.1136/jme.2005.013920 | issue=6 | pmc=2563373}} His argument is controversial.{{cite journal |url=http://jme.bmj.com/content/32/6/355.full#responses |title=The rhythm method and embryonic death |year=2006 |pmid=16731736 |access-date=10 July 2013|last1=Bovens |first1=L. |journal=Journal of Medical Ethics |volume=32 |issue=6 |pages=355–356 |doi=10.1136/jme.2005.013920 |pmc=2563373 }} The age of gametes at the time of fertilization has been shown to have no effect on miscarriage rates in most cases, but is a significant risk factor where there is history of miscarriage.{{cite journal |vauthors=Gray RH, Simpson JL, Kambic RT | title=Timing of conception and the risk of spontaneous abortion among pregnancies occurring during the use of natural family planning |journal=American Journal of Obstetrics and Gynecology |date=May 1995 | volume=172 | issue=5 |pages=1567–1572 | pmid=7755073 | doi=10.1016/0002-9378(95)90498-0 }} Age of gametes at the time of fertilization has been shown to have no effect on low birth weight or preterm delivery.{{cite journal |vauthors=Barbato M, Bitto A, Gray RH | title=Effects of timing of conception on birth weight and preterm delivery of natural family planning users | journal=Advances in Contraception | date=June–September 1997 | volume=13 | issue=2–3 | pages=215–228 | pmid=9288339 | doi=10.1023/A:1006508106197 | s2cid=24939823 |display-authors=etal}}
Viability and established pregnancy
A related issue that comes up in this debate is how often fertilization leads to an established, viable pregnancy.{{Citation needed|date=June 2010}} Research in in-vitro fertilization patients suggests that fertilized embryos fail to implant some 30% to 70% of the time, although it is unknown whether this rate corresponds to inherently low human implantation rates (in natural conception) or to an altered physiological state.Kennedy, T.G. [http://publish.uwo.ca/~kennedyt/t108.pdf Physiology of implantation]. 10th World Congress on in vitro fertilization and assisted reproduction. Vancouver, Canada, 24–28 May 1997.{{cite journal |vauthors=Smart Y, Fraser I, Roberts T, Clancy R, Cripps A | title = Fertilization and early pregnancy loss in healthy women attempting conception | journal = Clin Reprod Fertil | volume = 1 | issue = 3 | pages = 177–84 |year = 1982 | pmid = 6196101}} Of those that do implant, about 25% suffer early pregnancy loss by the sixth week LMP (after the woman's Last Menstrual Period), and an additional 7% miscarry or are stillborn.{{cite journal | pmid = 10362823 |name-list-style=vanc| last1 = Wilcox |first1 = AJ| doi=10.1056/NEJM199906103402304 | last2 = Baird | first2 = DD | last3 = Weinberg | first3 = CR|author3-link=Clarice Weinberg |title = Time of implantation of the conceptus and loss of pregnancy | journal = The New England Journal of Medicine | volume=340 | issue=23 |date=June 1999 | pages=1796–9| doi-access = free }} As a result, even without the use of birth control, between 50% and 70% of zygotes never result in established pregnancies, much less birth.
Ethics of preventing implantation
The intention of a woman to prevent pregnancy is an important factor in whether or not the act of contraception is seen as abortive by some anti-abortion groups. Hormonal contraceptives have a possible effect of preventing implantation of a blastocyst, as discussed previously. Use of these drugs with the intention of preventing pregnancy is seen by some anti-abortion groups as immoral. This is because of the possibility of causing the end of a new human life.{{cite web |last=Finn |first=J.T. | title = "Birth Control" Pills cause early Abortions | work = Pro-Life America — Facts on Abortion | publisher = prolife.com | date = 2005-04-23 | url = http://www.prolife.com/BIRTHCNT.html | access-date = 2006-08-25 | archive-url= https://web.archive.org/web/20060819091653/http://www.prolife.com/BIRTHCNT.html| archive-date= 19 August 2006 | url-status= live}}
However, hormonal contraception can also be used as a treatment for various medical conditions. When implantation prevention is unintentionally caused as a side effect of medical treatment, such anti-abortion groups do not consider the practice to be immoral, citing the bioethical principle of double effect.[http://www.epm.org/articles/BreastfedAbortions.html Doesn't breastfeeding do the same thing as the Pill?] {{Webarchive|url=https://web.archive.org/web/20061015142929/http://www.epm.org/articles/BreastfedAbortions.html |date=2006-10-15 }} Eternal Perspective Ministries, 2006. Accessed May 2006. Likewise, when a hormonal contraceptive is used with the intention of preventing fertilisation, the intended reduction in implantation failures, miscarriages and deaths from childbearing may outweigh the possibility that the method might cause some implantation failures.{{Citation needed|date=June 2010}}
A related application of the principle of double effect is breastfeeding. Breastfeeding greatly suppresses ovulation, but eventually an ovum is released. Luteal phase defect, caused by breastfeeding, makes the uterine lining hostile to implantation and as such may prevent implantation after fertilization. Some pro-choice groups have expressed concern that the movement to recognize hormonal contraceptives as abortifacient will also cause breastfeeding to be considered an abortion method.{{cite web | title=Emergency Contraception & Conscience: Christian Right Attacks on Contraceptives | work=About.com Religion & Spirituality Agnosticism / Atheism | url=http://atheism.about.com/od/abortioncontraception/p/MorningAfter.htm | access-date=2006-06-22| archive-url= https://web.archive.org/web/20060628233620/http://atheism.about.com/od/abortioncontraception/p/MorningAfter.htm| archive-date= 28 June 2006 | url-status= live}}{{cite magazine | first=Russell | last=Shorto | title=Contra-Contraception | pages=4 of 9-page online article |date=2006-05-07 | magazine=New York Times Magazine | url=https://www.nytimes.com/2006/05/07/magazine/07contraception.html?pagewanted=1&ei=5088&en=fd92772f01a5c709&ex=1304654400&adxnnl=0&partner=rssnyt&emc=rss&adxnnlx=1151015936-QF5/uHStQAb9tAkPSzv7uw }}
Detectable pregnancy
A protein called early pregnancy factor (EPF) is detectable in a woman's blood within 48 hours of ovulation if fertilization has occurred. However, testing for EPF is time-consuming and expensive; most early pregnancy tests detect human chorionic gonadotropin (hCG), a hormone that is not secreted until after implantation. Defining pregnancy as beginning at implantation thus makes pregnancy a condition that can be easily tested.{{Citation needed|date=April 2010}}
Philosophical issues
The distinction in ethical value between existing persons and potential future persons has been questioned.Page 212 and 213 in: Abortion and the Golden Rule By R. M. Hare. Philosophy and Public Affairs. Vol. 4, No. 3 (Spring, 1975), pp. 201-222 [https://www.jstor.org/stable/2265083] Subsequently, it has been argued that contraception and even the decision not to procreate at all could be regarded as immoral on a similar basis as abortion.Do Potential People Have Moral Rights? By Mary Anne Warren. Canadian Journal of Philosophy. Vol. 7, No. 2 (Jun., 1977), pp. 275-289 [https://www.jstor.org/stable/40230690] In this sense, beginning of pregnancy may not necessarily be equated with where it is ethically right or wrong to assist or intervene.{{Citation needed|date=May 2010}} In a consequentialistic point of view, an assisting or intervening action may be regarded as basically equivalent whether it is performed before, during or after the creation of a human being, because the result would basically be the same, that is, the existence or non-existence of that human being.{{Citation needed|date=May 2010}}
See also
Notes
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