Ovulation usually occurs within 24-48 hours after the injection of human chorionic gonadotropin. When monitoring ovulation, if there is a dominant follicle, you can inject 5,000-10,000 IU of human chorionic gonadotropin intramuscularly, and ovulation usually occurs within 24-48 hours of the intramuscular injection. Therefore, if you choose to have intercourse within 24 hours after the intramuscular injection, your chances of getting pregnant will be greatly increased. It is also a good idea to monitor the follicles again after the human chorionic gonadotropin injection. This is because there are also women who have had egg-breaking injections and still have not ovulated due to thick follicular walls, etc. Additional doses are needed if necessary. Another ultrasound can be done to find out if the follicle has ovulated and also to determine the time of ovulation. After the injection of human chorionic gonadotropin to pay attention to more rest, maintain a good mood, can be under the guidance of the doctor coitus, to increase the chances of pregnancy.