Hello everyone. I've had stomach cramps for 24 hours now, like during …

Hello everyone. I've had stomach cramps for 24 hours now, like during my period. It seemed to pass throughout the day, then reappeared. In the evening it started again and was accompanied by back pain. Went into the shower and it helped. But then it came back again. Lying down and my stomach still hurts. What is this and should I worry about my due date?