How does it prevent pregnancy even if a couple does unprotected sex? (I’m aware it’s not 100% effective but still)
In: Biology
Women naturally have a cycle of hormone levels about once every 28 days (varies). Mostly progesterone, estrogen, testosterone, etc. They make the menstrual cycle happen, which can become pregnancy after sex.
There is not just one birth control pill. The various options have different actions, but they all work by managing the sex hormones during the cycle. Some prevent the egg follicles from maturing, some prevent any fertilized egg from attaching to the uterus, some even prevent periods completely.
The point is, they either prevent an egg from being available, or ensure it can’t develop into a fetus.
If they fail, there’s plan B, which will provide such a shock to the hormones that the uterus empties out immediately. Its like the worst period ever.
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