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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.
The luteal phase lasts for approximately two weeks. During this time, a corpus luteum forms in the uterus. The corpus luteum is made from a follicle that housed a maturing egg. The corpus luteum starts to form as soon as a mature egg pops out of the follicle. The corpus luteum is essential for conception to occur and for pregnancy to last. Function