I have not gotten a positive opk. I have only used them for 2 cycles, and I'm not sure if I just missed my surge or drank to much fluids or what. Around the time glow said I was going to o ovulate I started getting a second line, it got a little darker after a couple days but never close to positive. Now it's completely gone again? I workout in the morning so I drink lots of fluids.. Not sure if that matters. I've been checking my cervix and it has been changing the same way it should when ovulation occurs. I'm just wondering does it sound like I'm ovulating and not catching my surge or is it possible that I'm actually not ovulating?