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carpson02 · 08-11-2010, 05:51 AM

The hormones in birth control pills combine to prevent the body from releasing an egg. Should an egg be released, the progesterone makes it difficult for the egg to travel down the fallopian tube, and also alters the uterine lining to prevent implantation in the unlikely event of fertilization. In addition, progesterone thickens cervical mucus, so that sperm have difficulty navigating. The combination of estrogen and progesterone make pregnancy a challenge, although it can happen.

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carpson02 Junior Member Offline Posts: 9 Join Date: Aug 2010 Location: US	08-11-2010, 05:51 AM The hormones in birth control pills combine to prevent the body from releasing an egg. Should an egg be released, the progesterone makes it difficult for the egg to travel down the fallopian tube, and also alters the uterine lining to prevent implantation in the unlikely event of fertilization. In addition, progesterone thickens cervical mucus, so that sperm have difficulty navigating. The combination of estrogen and progesterone make pregnancy a challenge, although it can happen.