Using a test strip eight days after intercourse will not fully check for an accurate pregnancy. Usually, you should use a pregnancy test one week after your period has been delayed, or you can go to the hospital about ten days after intercourse to take a blood test to see if you are pregnant. If you want to test for pregnancy after eight days of intercourse, try to go to the hospital and use a blood test to be more accurate. If you are using test strips to test for pregnancy, you need to wait 15 days after intercourse to get a more accurate result. The test can also be done with early morning urine after the period has been delayed for ten days, or you can go to the hospital for an ultrasound after the period has been delayed for a week. ultrasound can not only check whether there is a pregnancy or not, but also check whether it is an intrauterine pregnancy or an ectopic pregnancy, and it can also determine the gestational age of the pregnancy. If a woman wants to use a test strip to test, she can wait until the best time to test or go to the hospital for a checkup.