After ovulation, the corpus luteum is formed in the ovary, and the corpus luteum will secrete more progesterone, and the elevated level of progesterone in the body will stimulate the thermoregulatory center of the brain to raise the body temperature, which will rise by about 0.3-0.5℃, which is a normal physiological phenomenon. If ovulation occurs, the body temperature will rise. If the body temperature does not rise, it means that there is no ovulation, so there will be no pregnancy. If you detect ovulation by measuring basal body temperature, you can start on the 1st day of menstruation, wake up in the morning without any activity to take the measurement, and then record the temperature on the temperature monitoring table, and then connect the measurements into a line, if it shows biphasic, it means ovulation, and if it is monophasic temperature, it means there is no ovulation. In addition, you can use ovulation test paper to self-monitor whether you are ovulating or not, but the most accurate monitoring method is to use ultrasound for dynamic observation.