Two bars on a pregnancy test overwhelmingly means pregnancy. Two bars on a pregnancy test means elevated HCG in the urine, which in the vast majority of cases means pregnancy, but there can still be other circumstances that lead to elevated HCG in the urine rather than a normal pregnancy. For example, most of the expired pregnancy tests will react with the urine, but due to the reaction is not complete enough, there will be the results and the real situation is not the same phenomenon, such as still appear two bars, but the color for a dark and light situation, this situation is not pregnant. There are also patients with trophoblastic diseases who are not pregnant but have elevated HCG in the urine, which can be detected by ultrasound. In order to avoid these situations, if the pregnancy test shows two positive bars, it is recommended to go back to the hospital for a blood HCG test or an ultrasound to determine if you are really pregnant.