Pregnancy test after 7 days generally can not be detected, can be a few days with morning urine for testing. Under normal circumstances, after intercourse, the sperm enters the fallopian tube cavity, and if it happens to be in the ovulation period, the sperm and the egg will combine to form a fertilized egg in about 30 hours, and after the fertilized egg combines into a fertilized egg, it will take another 6~7 days for the fertilized egg to implant, and the fertilized egg will start to produce HCG after it implanted, and it will be released in the blood and the urine. On the 7th day after the pregnancy, the fertilized egg may not yet have attached to the bed or may have just attached to the bed, even if there is HCG released, the content is very low, and usually cannot be detected by pregnancy test, but it can be detected in the peripheral blood on the 2nd day after the attachment of the egg. If you want to detect pregnancy earlier, you can go to the hospital about 8 days after the event to take a blood test. If you want to use a pregnancy test, you can wait for about 10 days after intercourse to use morning urine to test, so that the results are more accurate. If you have detected pregnancy with a pregnancy test, you should go to the hospital for regular checkups to observe the development of your baby at any time.