Follicle monitoring in the hospital is usually done by transvaginal ultrasound. For women with regular menstrual periods, follicle monitoring starts on the tenth day of menstruation and is repeated 1-2 days later depending on the results of the monitoring. In addition to this method, the basal body temperature can also be measured or the discharge can be checked to determine the general picture. During ovulation, along with the increase of progesterone, the vaginal discharge will change, showing a large amount, thin and easily stretched. During the 1-2 days before and after ovulation, the number of intercourse should be increased to increase the chances of pregnancy. Ovulation is mainly influenced by the reproductive endocrine axis, but also has a certain relationship with external factors such as weather and climate, weight change, etc.