Positive OPK test on cycle day 12 of a 26 cycle, rarely 28 day

Br

I'm on cycle day 12 and got a positive opk test just after 10 AM. I'm getting to the point where I don't care, though, because even though I'm getting positive tests, and we're having sex I'm still getting my period every month. I almost didn't test this month, but I thought better of it and have been doing so. A part of me is thinking, what does it matter? You're going to get your period anyway. Have any of you felt this way before?