Pregnancy cannot be detected after four days of intercourse and can usually be detected after ten days of intercourse. Pregnancy, also known as gestation, is the process by which an embryo or fetus is nurtured and grows inside a nursing female. The chances of pregnancy are not the same for each person because of their different habits and health conditions. Ten days after intercourse, you can go to the hospital to have your blood tested for human chorionic gonadotropin levels to determine if you are pregnant, or you can use an early pregnancy test. There are three types of early pregnancy test results: a. Positive, which means two dark bars, indicates pregnancy. A negative test, which is a single bar, means you are not pregnant. Third, a weak positive test, which means one dark bar and one light bar, can be caused by various factors such as dilution of urine. However, the chances of pregnancy are high, so it is important to review the test after a week and, if necessary, have blood drawn at the hospital to check the level of human chorionic gland promoting hormone to determine if you are pregnant.