I started metformin last cycle after being diagnosed with PCOS. It started my cycle and today I'm on CD14. I started doing OPKs on CD7 (it's my first time trying them) and have gotten negatives this whole time. The last couple of days it was getting darker, so I upped it to twice a day in hopes to not miss it. This morning my OPK was the darkest it's been, but still not quite at the point it could be considered a positive. And now the one I just took tonight was MUCH lighter. Could I have missed the surge in that period of time? Or do I just keep taking OPKs and see what happens?