This is my first month using OPKs. I am using clinical guard, the super cheap ones with red lines. Well, I have yet to even get a faint line. My body is telling me it is either ovulating or just about to, but nothing at all in the OPKs. I expected to get faint lines, but still nothing, does anyone have any advice or experience with this? I did some research online and saw that some women never got a positive but still got pregnant. I'm just a bit confused/worried. Thanks!