I took a test at 5 am, waited about 2 min and saw nothing so I threw it away. I think it says to discard any test after 10 min so not to get a false response. A few hours later I got an urge to check it and this is what I saw. I read evap lines are gray or colorless, this clearly has color. I'm trying not to get excited over something that may be false. Is it possible to change from negative to positive in a few hours??  Opinions???