Illustration of the correct use of pregnancy test paper Pregnancy test paper is a tool most commonly used by modern women to self-detect pregnancy. It has high accuracy and is simple and convenient to operate. However, during use, some people may encounter situations where improper use results in inaccurate results. Below we will introduce in detail the correct steps for using pregnancy test paper. Step 1: Choose the right time. The most suitable time to use the pregnancy test paper is 7-10 days before the expected menstruation. This time period is when a hydatidiform mole or mole has not formed after conception.