I used an OPK (ovulation predictor actually dipstick) for 11 days straight and never a positive result. Somewhere within those 11 days I’m pregnant. I’m looking for my second attempt three years later and have not yet become a positive. Who knows how this foolproof? Any similar situations? I’m ready Toni W. ‘s book and TCOYF totally agree there – just thought that was a good backup cycles, as are my SO long!