It is a normal physiological manifestation for a woman to detect pregnancy on the 10th day of intercourse by using an early pregnancy test or by going to the hospital for a blood HCG test, because the woman’s egg may have been discharged and is waiting for fertilization in the fallopian tube when the two partners have intercourse. On the second day after fertilization, the egg will cause an increase in HCG in the blood and pregnancy can be detected by a blood HCG test, which can be done as early as the eighth day after intercourse. If the HCG in a woman’s blood grows particularly fast after pregnancy, it will indirectly cause an increase in HCG in the urine, and a weakly positive indication of pregnancy may be detected with an early pregnancy test on the 10th day after intercourse.