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Luteal phase. The luteal phase is the latter phase of the menstrual cycle (in humans and a few other animals) or the earlier phase of the estrous cycle (in other placental mammals). It begins with the formation of the corpus luteum and ends in either pregnancy or luteolysis.
Ordinarily the luteal phase of a womanâs cycle is around 12-14 days, even if you have a very long cycle. The follicular phase may vary from woman to woman but the luteal phase is normally around 12-14 days for most women. A luteal phase that is shorter than 12 days may be a concern for some women.