If a couple engages in unprotected sex, pregnancy can be checked by testing for human chorionic gonadotropin values. This can usually be done with a urine test around 10-14 days after intercourse and a blood test around 7 days. When a woman of childbearing age has unprotected sex, a fertilized egg can form and successfully implant in the uterine cavity in about 7 days. Upon implantation, human chorionic gonadotropin is secreted, and human chorionic gonadotropin is relatively elevated in fertilized eggs in normal people who are pregnant. Therefore, for women who want to test whether they are pregnant or not, they can determine whether they are pregnant by checking the value of human chorionic gonadotropin in their urine or blood. Usually, a urine test for HCHG can be done around 10-14 days after intercourse, and morning urine is preferred. Alternatively, a blood test can be done about 7 days after intercourse to determine if you are pregnant. For women who suspect pregnancy, they need to go to the hospital and undergo relevant tests to determine if the pregnancy is intrauterine.