OPK- on period yet getting a faint line?

I have pcos and just got my first period in a while that is just winding down tonight- like i’m still bleeding but mostly only when I wipe. Anyway, I wanted to take an opk to watch the line slowly get darker as time goes on and yesterday I did one and it was completely negative as I had bought these on amazon and didnt know if a negative would have an indent.. Which it didn’t yesterday. Here’s the one I just took today (pic at 3 minutes) It looks like there’s a faint line??? What does that mean?? Could my period be affecting it or making it read like that? I figured it would only get a line like that as I got close to my ovulation window???