OPKs are confusing! Please help!

I recently started to use the Clear Blue Easy Read Digital OPKs and am getting a little concerned because I still haven't gotten a "peak day" reading. For those that haven't used them, there is a reader that the sticks get inserted into, so the photo isn't of one that's been taken apart. Can I still interpret the lines like any other opk (to some extent)? I have two lines, and even though the one isn't as dark as the control, can I still assume some of the hormone is detected, I'm just not quite there yet? I'm starting to freak myself out that I'm not even ovulating....