If the HCG value is less than five, it means that there is no pregnancy. The HCG test should be done only after 10 days of intercourse. If the number of days of intercourse has not reached 10 days, it is possible that the concentration of human chorionic gonadotropin has not yet reached a certain value and the test does not reach the highest value, so the test cannot be detected. If it has reached 10 days, but this value is less than five, it can be accurately determined that there is no pregnancy. This is one of the most scientifically based and accurate indicators for checking early pregnancy, and it is an important indicator to know if you are pregnant at the earliest. If the pregnancy test is confirmed, the HCG value increases very quickly, doubling every other day. This is a sign of a well-developed gestational sac.