1. What is a pregnancy test paper? A pregnancy test paper is a simple and easy-to-use testing tool that can be used for self-testing at home to determine whether you are pregnant. The test is usually done using a urine sample to determine pregnancy by detecting the level of human chorionic villi (hCG) in the urine. 2. The best time to use pregnancy test strips The best time to use pregnancy test strips is to test about 7 days after the expected start of the menstrual cycle. If you are pregnant at this time,