48 hours after the ovulation injection, intercourse may still be pregnant, the chances of pregnancy will be relatively small. The survival time of the follicle is generally 24 hours to 48 hours, of which 24 hours is the most vigorous, 48 hours after the follicle may have apoptosis. Therefore, the time of coitus should be controlled within 24 hours after the ovulation injection to increase the chance of pregnancy, if more than 48 hours, the probability of pregnancy will be significantly reduced. Each woman’s situation will have certain differences, after the ovulation injection, the follicle growth and development to discharge this time will have certain differences, therefore, it is generally recommended that after the ovulation injection, you can use ovulation test paper or ultrasound to monitor, so that the accuracy may be higher, if the monitoring process found that the follicle has already been discharged, you can arrange for coitus as soon as possible. It is recommended that during the preparation period, both men and women usually pay attention to rest, do not stay up late, quit smoking and drinking, and exercise properly to enhance physical fitness.