OPK Help!

S

So, for the past 3 days I have been doing a opk. I’m not real sure about them as they are CVS brand. I’ve used FR opk (ovulation predictor kit) in the past, and never got a ‘true’ positive. It was very close and the next times I tested it got lighter so I assumed I peaked and didn’t catch it on a test. Can anyone help me with this month’s opk? It seems to have gotten darker but is now going lighter. I don’t think I’ve reached a peak yet. I am in my fertile window and am pretty on point with it.