It prevents ovulation..it doesnt kill a fertilized egg
Posted on: May 18, 2019 at 10:35:02 CT
Spanky KU
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When you take Plan B or a generic progestin-only pill, you are actually taking a high dose of progesterone, which is the same stuff that is in the kind of birth control pills that some people take every day. The high dose of progesterone can thicken the cervical mucus, which makes it harder for the sperm to get to the egg. And if you haven't ovulated—ovulation is when the ovary releases an egg—it can delay the process, which is another way to keep sperm from reaching the egg.
Preventing or delaying ovulation is the primary mechanism by which Plan B prevents pregnancy. Without ovulation, there can be no fertilization. Without fertilization, there can't be implantation in the uterus, which is the thing that triggers the hormones that let your body know you are pregnant.