If you are pregnant and want to take a blood test for human chorionic gonadotropin, you can do so as long as it takes longer than a certain amount of time. You can go to the hospital to have a blood test for human chorionic gonadotropin more than about eight days after intercourse, and the results will be equally accurate. The value of human chorionic gonadotropin is different from hospital to hospital because the test strips are different, some reference standard is 0-5IU/L, some reference standard is 0-15IU/L, some reference standard is 0-25IU/L. As long as the result of the test is lower than the normal range, it means that there is no pregnancy, and if the result is higher, it means that there is already a conception. Meanwhile, if you want to continue the pregnancy, pay attention to the pregnancy test. If you want to terminate the pregnancy, it is recommended to have an ultrasound at around 42 days of pregnancy, as long as the gestational sac is above 1cm.