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How does the menstrual cycle relate to pregnancy?

Answer:
The female uterus is always preparing to take care of a baby, so it starts forming a protective and insulating layer of flesh, blood, and other substances. When you don't get pregnant, though, the uterus does not need this coating of protective layers, so it excretes it through the vaginal opening, and that is your period.
First answer by Galebrow. Last edit by Galebrow. Contributor trust: 13 [recommend contributor recommended]. Question popularity: 0 [recommend question].

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