The next night after the ovulation injection is the best time to have intercourse, because after the injection under normal circumstances within 36 hours will be ovulated, so the next night after the injection to the time of ovulation, the chances of pregnancy is the highest at this time to have intercourse. Because the sperm can survive up to 3-5 days, you can have intercourse on the first night of the ovulation injection, and then again on the second night so that you won’t miss the ovulation time, and the success rate of pregnancy will be significantly higher. It is recommended that patients arrange for intercourse on the evening of the second morning and the evening of the third day morning, because the egg can survive in the uterus for 24 hours at the most, so you need to grasp the opportunity so as to avoid failure to successfully conceive. Clinically, some women have dominant follicles but do not necessarily ovulate after ovulation stimulation injections. It is recommended to go back to the hospital the next morning to check the follicles and monitor the ultrasound to determine whether ovulation is occurring.