Not ovulating?

Jessica • Wife, hound mom, excited and hopeful for a sticky rainbow baby (due in October!)

I stopped birth control at the end of July/early August. I started my period September 2nd (a little later than expected but not too much). So I started using OPKs on the 11th to see if I could pinpoint my ovulation and get a better feel for my cycle off the pill. Now it's the 18th and I haven't had a positive one yet...took it same time every day. Am I not ovulating yet (since coming off the pill)? Or should I keep testing?