The hormonal changes used to mitigate ovulation also mitigate the swelling of the uterine wall that usually coincides with the ovulatory portion of the menstrual cycle. There is debate as to whether bcp acts as an abortifacent (causing abortions of zygotes) but I would make the moral and legal argument that the bcp is specifically targeting a block of ovulation through hormonal adjustment not the intentional targeting of an organism we know to exist as is the case with general abortion.

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