With test strips, pregnancy can usually be detected as early as 2 weeks after the formation of a fertilized egg, i.e. more than 15 days after intercourse. 6-8 days after the formation of the fertilized egg, it begins to settle in a suitable position in the uterine cavity, at which time the trophoblast cells begin to secrete human chorionic gonadotropin, which serves to contribute to the maintenance of pregnancy, and can be present in the blood at a high level of growth on the 8th-10th day after the formation of the fertilized egg, this hormone can be detected in the urine about 10 days after conception. A weakly positive or negative result is detected and can be retested for dynamic observation. If necessary, you can also go to the hospital for a blood test, as a blood test is more accurate and objective than a residual urine result, and both can be dynamically observed and reviewed. When the HCG in the blood shows a tendency to rise exponentially, it suggests that the cells of the syncytiotrophoblast are well energized, which basically clarifies that there is a pregnancy. Please go to the hospital to confirm the diagnosis when the above symptoms occur, so as to avoid affecting the pregnancy due to negligence.