Ovulation help needed

Kay • Mama to a beautiful boy 🌈

So long story short, I had a very nasty drawn out missed miscarriage, and had an op early September. Anyway we’re now desperate to have our rainbow baby, and I’ve started tracking everything (which I didn’t do before) however my cycle is quite irregular. I tried to start using ovulation tests last cycle and never really got a positive so gave up and just bd most days instead to cover all eventualities. Anyway af turned up, and I’m going to try and track ovulation this month to make sure. But do I just pee test every morning for ovulation lines? It just gets very expensive when I had no idea when I’m going to ovulate because my cycles irregular. Any ideas girls?