AF due 3/7

Morgan • mom of 2. pregnant with #3. nurse. wife.
AF is due 3/7. I'm not sure how many DPO I am. I got a positive ovulation test on 2/18. I've taken two tests and both were negative. I'm tired, but I don't know if I'm more tired than usual. I've been having quite a bit of cramping but I'm not sure if it's different from menstrual cramps that I always get before AF. Anyone else in the same boat?