15 days can you tell if you are pregnant?

15 days after the same room can be detected out pregnant. This time to detect pregnancy, then normal is to do blood HCG test. If pregnant, this time the blood HCG concentration is normal is more than 50 units. If the test, the blood HCG concentration value is greater than 10 units, but did not reach 50 units, can not be completely diagnosed pregnant, can be reexamined one day later. According to HCG secretion to determine whether pregnant. If the HCG concentration in the blood test 15 days after cohabitation does not exceed 10 units, you can determine that there is no pregnancy. The time to detect pregnancy with urine early pregnancy test is relatively late, and it needs to be tested after about 20 days after cohabitation.