OPK + on CD 18/19

I had been temping from December 2014-May 2015 and had no luck with the temps (and yes I was doing it right). So I decided to do strictly opk's to take a break from the temp madness and realized that I ovulate way later than I had thought. I started using first response digital tests in May and I got positives on cycle day 18 for the first cycle and cycle day 19 for the second cycle which makes me think they are pretty accurate. It turns out I have never TTC'd on those dates in the past and hoping that this will lead to a BFP. Anyone else ovulate late or have any stories to tell?