Pregnancy is usually not detectable when using test strips for 8 days after intercourse. If the sperm and egg successfully combine to form a fertilized egg after intercourse, it will implant in the uterus 7 to 10 days later, after which the woman’s blood HCG value will rise. Test strips are generally not able to detect pregnancy 8 days after intercourse, and early tests are prone to false negatives and less accurate results, so it’s best to test later. If you want to know whether you are pregnant earlier, you can go to the hospital to take blood tests, so you can quickly know whether you are pregnant or not. After diagnosis of pregnancy, you should follow the doctor’s advice to take obstetric checkups on time, and if you feel unwell, it is recommended that you go to the hospital in time and follow the doctor’s advice for treatment.