Abstract
The question of precisely when a human pregnancy actually commences has become the subject of increasingly intense public discussion. Is it at the time of gamete union (fertilization) or is it at the time when the blastocyst attaches itself to the endometrium (implantation)? If the former, then some argue that the intrauterine contraceptive device (IUD), the ‘morning after pill’ and, in some cases, the oral contraceptive pill should be reclassified as abortifacients rather than contraceptives, since they prevent the implantation of a fertilized egg but do not necessarily prevent fertilization. Some argue that such methods should therefore come under the control of abortion laws, with stringent control of their use. At present, these methods remain classified as ‘contraceptive’ in nature. What is not in dispute, however, are the facts that (1) a non-fertilized egg is not capable of implanting, and (2) a new human life will not be produced if a fertilized egg fails to implant. Consequently, the process of implantation is crucial in the process of the progression of a fertilized egg into a new individual.
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Poyser, N.L. (1986). Implantation. In: Bygdeman, M., Berger, G.S., Keith, L.G. (eds) Prostaglandins and their Inhibitors in Clinical Obstetrics and Gynaecology. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6734-5_7
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