Normally, a normal woman will ovulate one egg in a menstrual cycle and the other immature eggs will gradually disappear, so if she becomes pregnant, most pregnancies will be single. It is also possible for a woman to ovulate two eggs in one menstrual cycle, so twin pregnancies are also possible. If a woman applies ovulation stimulants during pregnancy, the probability of twin or multiple births increases. When a woman ovulates during her menstrual cycle, the vaginal discharge will increase and appear in a pulpy state. After the menstrual cycle is cleared, the follicles will start a new round of growth, and when they have grown to a large enough size to reach a dominant state, the eggs will be discharged. When observing the follicle development status, it can be monitored by ultrasound to clarify the specific number of ovulated eggs.