When did I ovulate?

I got a “positive” opk on CD 11, I haven’t been temping as I’ve had a tiny fever. So I think CD 12 was my ovulation day but thought I would get another opinion, I have been taking opks for 8 months and never had enough of the hormone to get a clear positive/peak test so it’s hard to tell sometimes but had all other signs that I’ve ovulated within the past three days. P.S I know the times are off I get my surge at 3am which I try to work around! thank you! x