1. Transvaginal ultrasound will be done on the fifth day after menstruation to understand the maturity of the eggs (left and right size, etc.). 2. Repeat ultrasound every other day until the dominant follicle reaches 22*20MM, which is the peri-ovulatory period, usually 5-8 days after menstruation (14 days before the next menstrual period). 3. Make sure to ask the ultrasound doctor to use a silicone condom without spermicide on the vaginal probe to prevent spermicide from damaging the sperm and affecting fertilization! 4, If there is no suitable condom, it is recommended to do transabdominal ultrasound to monitor ovulation (need to hold urine). 5.Report the results to your male doctor to discuss and decide the way and time to have intercourse. 6. 5,000-10,000 units of HCG can be injected at the time of maximum follicles to promote ovulation within 24 hours to improve the success rate of fertilization.