Confused: Positive OPK but still on period?

I’m on day 7 of my period (so cycle day 7) and I’m still bleeding moderately. I decided to take an OPK because I wanted to have a control. But it’s positive. What does this mean? Am I going to ovulate but I’m still on my period? I went off pill at the end of June and had a massive withdrawal bleed so I assumed my cycle is going to be crazy for a few months...

I don’t think I’m pregnant because I’ve had a really legit period for 7 days, which is pretty long for me. I’ll take a test soon just to be sure though.

I’ve already had one baby in 2017 and he was conceived immediately after I went off the pill, so he really made it easy!