A pregnancy test is a quick and convenient way to detect early pregnancy. The principle is to determine whether you are pregnant by detecting human chorionic gonadotropin in urine. In order to improve the accuracy of the pregnancy test, the following points should be noted in the process of use: 1. If your period is delayed for a week and you are not pregnant, you can use the pregnancy test. 2. Choose a valid and unexpired pregnancy test. 3. Read the instructions carefully before testing the correct test method. 4. The specific operation is as follows: take the morning urine in a clean container, pinch the handle end of the pregnancy test stick with your hand, insert the test end into the urine not to exceed the detection line, wait for 3 seconds to take it out, take out the pregnancy test stick and put it flat, observe for 5 minutes, show a red bar is a negative indication of not pregnant, show two bars is a positive indication of pregnancy.