It usually takes about 10 days for the test paper to detect pregnancy. When a woman is pregnant, the sperm and egg combine to form a fertilized egg, which slowly travels to the uterine cavity and is implanted in the uterine lining, a process that takes about a week. This process takes about a week. After implantation in the uterine lining, the woman’s body will secrete blood human chorionic gonadotropin, and at this time, you can determine whether you are pregnant or not by testing the level of human chorionic gonadotropin in your blood, which is the earliest means of determining pregnancy. Because the test paper to detect pregnancy is not as sensitive as the test blood, if you want to test urine to determine whether the pregnancy, usually need to have intercourse for more than 10 days to be able to detect through the test paper. Therefore, if you want to test for pregnancy, it is recommended that you stop menstruating long enough before testing, otherwise it is easy to get a false negative. If there is a delay in menstruation, it is best to go to the hospital as soon as possible to find out whether there is a possibility of pregnancy.