Pregnancy can be detected as early as 7 days after intercourse, but in slower cases it may take more than 10 days to detect pregnancy because the sperm stays in the body for 1-3 days after intercourse and the egg is viable for 2-3 days, so there is a 3-day fluctuation time as conception is possible within this 3-day period. The fertilized egg enters the uterine cavity and begins to develop into an embryo before the human chorionic gonadotropin in the blood rises, so it takes about 7 days for pregnancy to be detected. It is advisable to check the chorionic gonadotropin in the blood after 10 days for insurance purposes or to take a pregnancy test, which is relatively accurate. If you take a test too early, you may get a false negative.