How Do I Determine My Luteal Phase Length?

Women's menstrual cycle begins with the first day of menstruation. The length of the cycle varies from person to person, ranging from 21 to 35 days, with an average of about 28 days. Among them, it is divided by ovulation day and divided into pre-ovulation The follicular phase and the luteal phase after ovulation. The length of the follicular phase is not certain, but the luteal phase is fixed at about 14 days and up to two days. The next day after ovulation, the corpus luteum is formed, and secretion of lutein will increase the body temperature by about 0.6 degrees Celsius, which causes the body temperature to show a two-phase change. The high temperature period lasts about 12-16 days (average 14 days)