Confused

I track my ovulation to avoid pregnancy. I have a 2 year old and a 5 month old. I typically have 29-32 day cycles. 30 being the most common. I forgot to test on cycle day 15 but the test on cycle day 16 was about as dark as this one from today(cycle day 21) and continued to get lighter from there on so I figured my peak was on cycle day 15. Typically while tracking I never get an ovulation test this dark this late into my cycle(5-6dpo). Has anyone ever had this happen? Could it mean I didn’t ovulate the first time and now I am? I know levels can go up and down prior to period starting but this has never happened to me getting one this dark at this time since I’ve been tracking, so really hoping that’s not the case. If I was ovulating now that would mean I’d have a 36-37 day cycle which I’ve never had..