Opks dont confirm ovulation. You can have positives and not ovulate or get no positives and ovulate. You got peak on a digital. I wouldnt worry about not getting it on the strips. You probably missed the window for when it would be positive. My surge comes on so quick and short that I miss it pretty frequently. But I know I ovulated bc I temp. If this were me, I would stop opks and assume ovulation was the day after peak.