After ovulation, due to the formation of the corpus luteum to stimulate the body temperature center, will make the basal body temperature rise, then generally around 37 ℃, will not exceed 37.5 ℃, low cases will not be lower than 36.8 ℃. This high temperature will last at least 12 days or more, the clinical situation is normal. When the corpus luteum atrophies, the body temperature will drop, and after the temperature drops for about 24 hours, menstruation will occur, which is a menstrual cycle. If one is already pregnant, the high temperature will continue, because it is mainly the action of the corpus luteum that causes the temperature to rise continuously. Clinically, if you are planning to get pregnant, you should choose to have intercourse at the time of ovulation, and the basal body temperature will be persistently elevated after pregnancy.