You can take a pregnancy test two weeks after sex, and that’s when you can tell if you’re pregnant. If the pregnancy test is negative, pregnancy can basically be ruled out. Except for those who are particularly late in conception, a second pregnancy test will be needed a week later to determine conclusively whether or not you are pregnant. If you have sex right after ovulation, you can usually test for pregnancy about 12 days after sex. For those who are early to conceive, a pregnancy test can also be done 10 days after sex. The most sensitive indicator for pregnancy test is whether the chorionic gonadotropin is elevated in the blood, and if it is more than 5mIU/mL, pregnancy is confirmed. If you take a urine test, you will probably be able to find out if you are pregnant only after menopause, and the latest time to determine pregnancy is after 10 days of menopause by ultrasound.