As parturition nears, the levels of progesterone decrease; and the levels of estrogen increase.
Progesterone helps regulate your cycle. But its main job is to prepare the uterus for pregnancy. After ovulation, progesterone thickens the lining of the uterus in preparation for a fertilized egg. . When there are no more fertilized eggs, progesterone levels drop and menstruation begins.
Progesterone is a hormone that stimulates and regulates vital functions, plays a role in maintaining pregnancy, prepares the body for conception, and regulates the monthly menstrual cycle.
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