The fastest means of detecting pregnancy is usually a blood draw to check for changes in blood HCG, which is secreted by the villi in the body when pregnancy occurs. Therefore, it is more accurate and faster to draw blood for blood HCG 17-18 days after having intercourse during ovulation. Usually, when the sperm and egg unite to form a fertilized egg, it takes about 3-4 days to reach the uterine cavity and another 2-3 days for it to bed in the uterus. Once the fertilized egg has settled, the placenta will secrete chorionic gonadotropin, or HCG, a hormone that is excreted in the urine and can be detected with an early pregnancy test. However, HCG secretion is relatively low in the early stage and the test paper has false negative results, so you can’t tell whether you are pregnant by one test alone, you need to take several tests. The most scientific method is to take a blood test at the hospital after having intercourse during ovulation, about 17-18 days later, in order to be most accurate. The first thing you should do in your daily life is to pay attention to the maternity checkups in the early stages of pregnancy. About 6-8 weeks after menopause, you need to have an ultrasound examination to calculate the expected date of delivery. In early pregnancy, you should stop smoking and drinking, and pay attention not to be too tired. Especially pay attention to the safety of medication, do not contact with radioactive substances or harmful substances, to avoid fetal malformations, and generally do not recommend intercourse in the first three months of pregnancy.