Pregnancy test stick shows no pregnancy picture. How to use the pregnancy test stick. The pregnancy test stick is a tool commonly used by women in daily life to detect pregnancy, and it is also very simple to use. First, you need to prepare a pregnancy test stick and some urine. It is more effective to use in the morning before eating. Bury the probe on the side of the pregnancy test stick into the urine for at least 10 seconds, then place the pregnancy test stick on a flat place and wait for the test results. After waiting 2 to 3 minutes, you can see the results. Interpretation of pregnancy test results