Any chance my flow forecast is just wrong

Naomi

So here's my chart. Had unusual cramps for last 2 weeks which is unusual for me. Af is now late.. any chance you think my tracker is just wrong and actually I ovulated around CD19? My cm was eggwhite ish and then since then it's gone up... would also explain the dip at CD 23 (implantation?) any thoughts or is this just wistful hoping!

My period had been known to be variable by up to 5 days.