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A member asked:
Mechanics of why we have periods while on the pill? where does the blood come from, if no uterine lining was built up?
A doctor has provided 1 answer
Progesterone: Your body responds to the withdrawal of Progesterone. The first 3 weeks of pills have hormones. The last week does not. The withdrawal of hormones triggers the lining to shed. The Estrogen in the pill causes the lining to build up and Progesterone stabilizes it.
Answered 10/24/2016
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