Our expert says:
Even though you ovulated, you do not necessarily fall pregnant even if you have intercourse at that time. the luteal phase is the period between ovulation and menstruation. After ovulation, a corpus lueum is formed (the sca where the egg was). This usually disappears in a few days, but can sometimes persist longer than usual and cause an abnormal period. Involution is the absorption of the corpus luteum and failure of this means that it persists longer than it should.
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