What happens when the sperm enters but ovulation doesn't take place and therefore there is no egg present to be fertilised

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Solution

If the egg is not fertilized, the corpus luteum stops producing progesterone (after 10-12 days) and transforms into the corpus albicans, eventually transforming into scar tissue. The lack of progesterone causes the uterus lining to start to break up until it can no longer support itself. The lining of the uterus will then shed and a menstrual period will commence as the egg did not implant into the uterus wall.

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