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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.
Long Luteal Phase: What Does It Mean? 2016-06-22 babypedia. If youâre faced with the paradox of a late period and a negative pregnancy test, you might be confused. Could it be a long luteal phase? Is that even a thing? If youâre puzzled by your long luteal phase, youâre not alone. Letâs run through some of the possible causes of a long luteal phase, and what it means when youâre trying to conceive. What is a long luteal phase? First, a quick recap. The luteal phase is the second half of your menstrual cycle, after you ovulate and before your next period arrives. On average, this lasts about 13 to 14 days after ovulation, but can be as long as 17 days depending on the person.