Anyone use OPK to get a baseline before TTC?

Beth • FTM due May 16, 2018
I'm getting married this summer, and we want to start TTC in August. My periods are consistently inconsistent--anywhere from 29-45 day cycles. Should I use OPK in June and July to start looking for trends and seeing how it matches with the app? I was thinking of getting the Clearblue kit. Or should I just wait until August when we are ready to start for real?