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Without seeing the test it is hard to say. HOWEVER evaps do not have color to them (typically.) Or evaps can provide color but the test window is streaky or runny... not solid colored lines though. That being said test manufacturers say DO NOT rely on test results that are out of the test time length. BUT I have known many womens tests that have turned out to be positive when their lines have showed up past the allotted time. When did you take the first 3 tests? Same day? If so it is very curious that the first 3 were negative and now this ones positive IF TAKEN pretty close together. If taken other days or say those were in the morning and this ones at night... you could very well have a different result. One other note: I am unfamiliar with Walmarts First Signal... is it blue dye? If so they are notorious for false readings and evaps so be careful:) Best of luck:) XXX