It is not normal for pregnancy to be detected 6 days after intercourse. Usually, after a woman has intercourse during ovulation, it takes about 7 days for the fertilized egg to complete its implantation. It is likely that 6 days after intercourse the fertilized egg has not yet completed its implantation in the woman’s body and the test result is not accurate at this time. It is more accurate to test 7-10 days after intercourse or 3-7 days after the delay of menstruation. Early pregnancy test, blood HCG test, ultrasound and other methods are usually used to check if you are pregnant. It is better to use morning urine when testing with morning pregnancy test paper because the value of human chorionic gonadotropin in morning urine is higher in a day, so the test result is more accurate, and when two red bars appear on the morning pregnancy test paper, it means pregnancy. For the accuracy of the test, you can have a blood test for HCG and an ultrasound to determine the location, size and development of the gestational sac in the uterine cavity.