I'm on CD 39 and I know I'm not pregnant. I'm waiting for AF to show, and bought Clinical Guard ovulation and pregnancy tests for when my next cycle starts. Obviously, I went ahead and tested both out figuring that the hcg test would be negative (which it was) and that the opk would be too, but it doesn't seem to be. It looks pretty dark to me but I'm wondering if the line would need to be dark AND thick in order to actually be positive. What do you all think?? Or is it just normal to surge right before your period?