I have this abdominal cramp throughout my pregnancy from 8 weeks till 18 weeks. I couldn't even walk straight and fast. My gynae couldn't detect my problem but I made it a point to visit him every week to ensure that my baby was growing well. My gynae also gave me bedrest mc for one and a half month. What did your gynae say about your cramp? Did he do a detailed scan for you? Try to rest as much as you can with your leg up and dont walk too much. I find that walking actually worsen my cramp.