For those BFPs using dollar store tests!

Has anyone had very faint positives and everything been + on other brands or blood work? I'm early, 10dpo. I've been testing since 8dpo.. AF isn't due til Monday. I've taken 4 tests and they all have a second line. But within the 10 minutes they are very faint and then get bolder and thinner after I leave them for a while. (I know they say not to look after a certain time but let's be honest, we all do it! Lol) Could they be evap lines?? I'm hoping not but who knows. I hope everyone can give me some insight. I'm going to test in a few days again. Thanks!!!​I did a test with water to show myself that there is no second line on a negative from what I can see...