The luteal phase is the second half of the menstrual cycle, starting right after ovulation and ending just before the first day of the period. In a typical 28-day cycle, the luteal phase usually begins around day 15 and lasts about 12 to 14 days, although it can vary between 11 to 17 days and differs from person to person and cycle to cycle. During the luteal phase, the corpus luteum forms from the follicle that released the egg and produces progesterone and estrogen. These hormones thicken the uterine lining to prepare for a possible pregnancy. If fertilization does not occur, hormone levels fall, the corpus luteum dissolves, and menstruation begins. To summarize:
- Starts: Right after ovulation (around day 15 in a 28-day cycle)
- Ends: At the start of the next period
- Length: Typically 12 to 14 days, but can range from 11 to 17 days
If pregnancy occurs, the corpus luteum continues hormone production to support early pregnancy. This phase is crucial for establishing the conditions needed for a fertilized egg to implant and grow.
