Cramps during ovulation.

My OPT is positive today and it was positive for the past two days as well which means 3 days in a row but i have a little concern,i am having like periods cramps, my periods are due in two weeks so its impossible that my periods are coming when ovulation is still on!!I have appointment with gynecologist next week for something esle anyway but just thought i should ask you ladies if its something i have to be worried about coz i dnt have cramps when am on my ovulation period,this is new..Thanx