What are the chances?

I took two tests (one is above and below) yesterday and today but the faint lines aren't really getting any darker. I feel like a big dummy but what are the chances this could be positive?! AF is due Friday.... I know I should wait till Friday to figure it out for sure I guess I just thought I'd be more assured through a test and now I'm more confused than if it were just a straight BFN!! Help!