The blood test is not pregnant but two bars on the test paper may be a test paper detection error, because under normal circumstances the blood test is much more accurate than the test paper, the blood test not only can check whether a woman is pregnant earlier than the test paper, but also can detect the specific number, reflecting the content of chorionic gonadotropin in the body. In addition, its concentration in the blood is much higher than in the urine, so under normal circumstances if the blood test is not pregnant, then the test with urine is two bars, on the one hand, it may be the quality of the test paper is not good, on the other hand, it is possible that the test method is wrong, then you can observe when the menstruation is coming.