Generally, it takes about 24~36 hours to ovulate after the injection of chorionic gonadotropin, but there will be individual differences. Women with fertility requirements suffering from polycystic ovary syndrome and other ovulatory disorders, need to be under the guidance of a doctor to promote ovulation treatment, can be given chorionic gonadotropin ovulation treatment, before the use of drugs to exclude the pituitary gland hyperplasia or tumors and other contraindications, generally in the use of the drug will occur about 24 to 36 hours after ovulation, the available ultrasound to monitor the development of the follicle. However, there may be individual differences. When the intramuscular injection of chorionic gonadotropin may cause ovarian cysts or mild to moderate enlargement of the ovaries, may also have a slight stomach pain and pelvic pain and other adverse reactions, usually within 2 to 3 weeks to recover, must follow the doctor’s instructions for the use of drugs. When there is dominant follicular development monitored by ultrasound after the medication, coitus can be arranged under the guidance of the doctor to increase the chances of conception.