Opk help

I had a mild af at the beginning of this month. Hardly no cramps and a lighter flow. Normally my cramps are pretty bad and I'm curled up.in a ball for a few hours and the flow is worse. I've been taking an ovulation test every day since it ended which was around the 15th and the lines have been the same color every day, not quite as dark as the control line. I took.one today and it was the same. Is this normal? I've never had it happen before. Sorry to ramble, I'm just confused.