I never really noticed OV cramps either until I began TTC. Last month I had them for about 30 minutes one night, and then about 24hours later I received a positive OPK on an AM tinkle. Later that day I had about 1 hour of cramps at lunch time. This month, I have no OV cramps, even though I got a total of 2 positive OPK's yesterday. (I do currently have some stomach issues/diarrhea, which is typical for me at ovulation). So it seems to me that OV cramping varies month to month. 5 days of strong cramping does seem a excessive, though.