Is it possible to ovulate on a period?

I’ve had a 6 day period, very light spotting type of bleeding but I was testing ovulation all through as I’m very out of whack with my cycles and I’m trying to get as much info as possible regarding them! Anyway on day 5 I got a peak according to the Premom app 🤷🏻‍♀️ however my tests have been very up and down same with my temp any ideas? I can upload pics if necessary I was diagnosed with pcos around a month ago.