It is better to wait until a woman does not have a period when she should have one, it is more appropriate to go for a test at this time, if the patient happens to be pregnant during the preparation period, and the positive rate of the test is higher at this time. Women should pay attention to go back to the blood test after 48 hours to check whether the fetus is developing normally or not. The HCG concentration in the early pregnancy test increases exponentially after 48 hours, if it does not reach this condition there is a possibility that the pregnancy is ectopic or the embryo is not developing properly. The blood test is more accurate in early pregnancy because the development of the fetus is not yet visible by ultrasound.