Ovulation help

If I had positive ovulation tests on the 5/6/7 of September with the test on 6th being my peak (for the first time EVER my test line was darker than the control line) when do you think I would have ovulated? I’ve never properly seen a full ‘positive’ opk before so I’m not sure. The positives on 5 and 7 where as dark as control line then on 8th was completely negative.

I’ve been doing pregnancy tests but they’re just always bfns 😭😭😭 I had a chemical last month so I’m religiously testing but I’m guessing I’m out this month now if I’m still getting negatives :(