Positive ovulation test?

We’ve been TTC for 6 months now and I’ve only just start using opks. I’m irregular currently on cycle day 41, my cycle is usually anything up to 45 days. I’ve had what I think is a few positives various times throughout my cycle so put it down to a dodgy batch maybe. I’ve just opened a new pack and done this test and I believe that’s positive? Would I be ovulating this late? I’ve been getting back ache the past couple of days so I’m assuming I’ll be coming on any day now.