It is normal to detect pregnancy after 30 days of intercourse. Not everyone can detect pregnancy after a period of time after intercourse, because there are individual differences and each person’s ovulation time and fertilization time are also different. Therefore, it takes some time after intercourse to accurately determine whether you are pregnant or not. You can go to the hospital for a checkup 7-10 days after your period is delayed, and you can detect whether you are pregnant 21-25 days after intercourse according to the ovulation date. It is recommended to go to the hospital in time for a clear diagnosis as false positives may occur when testing with pregnancy tests.