Not going to hurt the baby. He or she is too well cushioned in his little water sac even to feel it. But as the others said, if you are really worried, you could at least call your doc.
Well I can see why you'd be worried. I'm about 15weeks & a week ago I got into a major car accident though i was wearing a seat belt my abdominal area took a bang. I got to the ER expecting disaster & then I heard my little ones heartbeat. Pure joy! I think it would have to be major in order to have issues. If the cramping continues follow up w/ your Dr. Its better to be safe than sorry.
I used to work at Walmart and a lil kid spun the thing and it hit my belly hard I cramped for a while I went in to make sure everything was ok but honestly your baby is protected by a lot of things where it didn't hit ur baby but if it makes u feel better go get checked out that's the safest thing to do