I have a cycle ranging between 32-38 days. Since a few days post ovulation I have had on and off lower back pain that sometimes radiates into my hips. Since cycle day 24 occasional abdominal cramps. Cycle day 27 I took a HPT and got a BFN. Today is cycle day 29 and I woke up with bad cramps and loose stools (sorry TMI). The cramps have calmed down but I have had a little nausea and my back pain stronger than ever. Any insight would be greatly appreciated!