For the time to detect pregnancy after intercourse, if a blood test for human chorionic gonadotropin is used, pregnancy can be detected seven days after intercourse. If an early pregnancy test or a pregnancy test is used, pregnancy can usually be detected 10-14 days after intercourse. If an ultrasound test is used, an ultrasound can show pregnancy about one month after intercourse. If you become pregnant after intercourse, you will first experience a delay in your period. If your period is delayed for more than a week, you will need to check if you are pregnant. If the pregnancy is unplanned, you can choose a medical abortion within 49 days of pregnancy and an abortion within 70 days of pregnancy.