Chorionic stimulation refers to injectable chorionic gonadotropin. Due to individual differences, there is no absolute time for when ovulation occurs after chorionic stimulation, but there is generally a higher probability of ovulation within 24-48 hours. Injectable chorionic gonadotropin is often used in women for ovulation induction therapy and in situations such as follicular puncture, which can alleviate low fertility due to ovulation or poor follicular maturation. The probability of ovulation is usually highest 24-48 hours after use, when the likelihood of conception is greatest if you are preparing for pregnancy and engaging in sexual intercourse. When using injectable chorionic gonadotropin, you should pay attention to the possibility of abrasions, pain, redness, swelling and other adverse reactions, for people suspected of androgen-dependent tumors can not be used, the use of which should be carried out under the guidance of a doctor, to avoid unauthorized use of the drug, to prevent triggering adverse consequences. It is recommended to prepare for pregnancy scientifically under the guidance of a doctor in order to improve the probability of conception.