Early pregnancy test paper can be false positive, such as the detection method is wrong, as well as other pathological factors, etc., may cause false positives. 1. Detection method error: for example, did not carefully check the expiration date and quality of the early pregnancy test paper, once the test paper expired or moisture may cause false positives, so the use of the test paper need to be carefully checked before. 2. Other pathological factors: If the body of the test subject has tumor diseases that secrete HCG (human chorionic gonadotropin), such as liver cancer, lung cancer and ovarian cysts, etc., and certain trophoblastic diseases, such as choriocarcinoma and hyperemesis gravidarum, etc., all of them may lead to false-positive test results. Therefore, early pregnancy test can not be used to diagnose pregnancy, but need to go to the regular hospital to receive blood HCG test to confirm the diagnosis.