Pregnancy cannot be detected by a pregnancy test when there is bleeding at the time of implantation. HCG levels in the blood gradually increase shortly after the fertilized egg is laid, and it takes about a week after that to test positive for HCG in the urine. A pregnancy test checks for HCG in the urine. At what stage of the implantation bleeding, when the fertilized egg has just been deposited, it is very difficult to detect it even with a blood test, let alone through a pregnancy test. Women who want to know if they are pregnant can use a pregnancy test one week after menopause, when the results will be more accurate and more informative. After checking the pregnancy, if there is no abnormality, ultrasound examination can be carried out again after 6 weeks of menopause, at this time, the embryonic buds as well as the primitive heart tube pulsation should be visible, which can determine the survival of early pregnancy in the uterus. If there is vaginal bleeding, hospitalization is recommended for definitive treatment.