Have you guys ever used an off brand ovulation predictor kit and not have it show when your ovulating? I always use ClearBlue and that always match perfectly with what my fertile time is in Glow! But with the Walgreen Brand ones I got it keeps saying it's not detecting the LH!! My periods/ovulation are like clockwork.. So glow keeps pushing my ovulation back because these test keep saying negative.. Could I actually not be ovulating at all this month? Help!!