OPK help please!!!

Okay, this is CD19 for me and I typically have a 28 day cycle. 
I thought the OPK next to the ? Was positive but now I'm not sure. They have began to get lighter so I don't know if I am not ovulating at all or if my positive isn't as blazing as others. The directions say the OPK is positive when the lines are of equal darkness or the test line is darker. These lines seemed equal upon drying. If anyone has experience with this please help!