Are pregnancy test strips accurate? Pregnancy is a physiological phenomenon that every woman may encounter. When you want to confirm whether you are pregnant, you can use pregnancy test strips to detect it. So, how accurate are pregnancy test strips? First of all, pregnancy test strips use human chorionic gonadotropin (hCG) in urine to identify pregnancy. In terms of classification, pregnancy test strips are divided into early test strips and ordinary test strips. Using early test strips for early pregnancy can improve the accuracy, while ordinary test strips are generally used for testing more than two weeks into pregnancy. When can I use test strips to detect pregnancy?