The pregnancy test does not need to be placed in the urine for 3 minutes so long, only 3 seconds can be, 1 minute can be read, 5 minutes after the reading is invalid. Currently on the market there are pregnancy test strips, ordinary pregnancy tests and electronic pregnancy tests, the operation is almost similar, it is best to test the 11th morning urine test after sleeping together with a higher rate of accuracy. A pregnancy test is a tool used by women to detect whether they are pregnant or not. The principle of the test is based on the human chorionic gonadotropin in human urine. If the pregnancy test shows two lines on the top of the test, it means that you are pregnant. The accuracy of the pregnancy test is high, but there are still false-positive results, so you need to take another test or go to the hospital for a blood HCG test and ultrasound to determine whether you are pregnant or not. If there are signs of pregnancy, consult a doctor in time to complete the examination and make a clear diagnosis. After the pregnancy is confirmed, regular obstetric examination to ensure the development of the fetus, abnormalities, timely consultation, so as not to delay the condition.