If the menstrual cycle is normal, ovulation occurs 2 weeks before the next menstrual period. If the menstrual cycle is more irregular, ovulation cannot be calculated using the menstrual cycle. Usually, a woman’s basal body temperature is low before ovulation and rises after ovulation. When the ovaries ovulate, the corpus luteum forms and stimulates the hypothalamic thermoregulatory control center by secreting more progesterone, resulting in an increase in the body’s basal body temperature, which remains high until the next menstrual period, when it begins to decline. Therefore, when the human body temperature starts to rise (by more than 0.3°C), ovulation has been completed. One week after menstruation, ultrasound can be done to monitor the development of the patient’s follicles and ovulatory activity. Some women can calculate ovulation according to their physical symptoms. If it is determined that there are no gynecological diseases, the leukorrhea during normal ovulation will increase significantly and change in a clear silk-like pattern. Slight abdominal pain, anal swelling and even a small amount of ovulatory bleeding may also occur after ovulation.