Menstrual Cycle - Take Blaktion
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NSW Government
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The time from the first day of one period to the first day of the next period. The cycle begins when the lining of the uterus (endometrium) is shed during menstruation. This is followed by follicle development in the ovaries, egg release (ovulation) and regrowth of the endometrium, all of which make pregnancy possible. When pregnancy does not occur, the endometrium is shed again.

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