Ovulation when?

Elizabeth

Hi so FF on the advanced setting won’t give me my cover line yet but on the OPK monitor setting it says I ovulated on CD 12 but today CD 14 I’m cramping like period cramps but my OPK shows low. CD 11-13 I had peak ovulation all day long as well which is unusual for this cycle. I usually only get 2 days of peak. Any ideas of when I may have ovulated?