question about OPK... please comment and help!

Kortney • Hopeful soon to be mommy
I just took this at about two minutes into the given time and I am wondering it is normal for it to be this dark when I am just finishing my period?! I will mention I am on clomid starting tomorrow, metformin currently taking and a prenatal. I didn't ovulate till cd 18 last month so is it normal to be that dark this early on?!