First time using OPK

Amanda
The top was from today and the bottom yesterday. From being a pee on stick addict, I look at the bottom (now) and convince myself it's an evap line. The line got darker.... I think. Anyways! My question is, does the line continue to get darker the closer I get to ovulating or does a line just appear no matter what? My cycle is weird, I don't think I ovulate when Glow tells me, but after... Which is about now. I'm so confused, no matter how much I read and obsess about having a baby.... I don't think it'll ever happen.