It is advisable to pay attention to the following things for the blood test for early pregnancy: 1. Blood is drawn for the test around 31-32 days after menopause because it is at this time that the trophoblast cells start to secrete blood HCG. 2. There is no need to fast before the blood is drawn because the result of HCG has nothing to do with diet. 3. It is better to have the blood drawn before 9:00 pm and the result will be available after 3:30 pm on the same day. In case of other clinical symptoms, such as irregular vaginal bleeding or pain in the lower abdomen, if necessary, blood can be drawn every other day to check whether the blood HCG value has doubled from the original one, so that the possibility of ectopic pregnancy can be ruled out.