How long does it take to test for pregnancy?

The principle of pregnancy test is that the contact between pregnancy test and urine can detect the presence of human chorionic gonadotropin in urine. If human chorionic gonadotropin is present in urine, then the pregnancy test will show two bars, indicating pregnancy. However, it takes time for human chorionic gonadotropin to appear in urine after pregnancy. How long can you use pregnancy test stick to detect pregnancy is also different from person to person, under normal circumstances in menstruation delayed a week to ten days when it is able to detect whether there is pregnancy, if not particularly sure can also go to the hospital to do a blood test.