Cramping.

Light cramping lower left side and slight twinge on right side at 7 weeks. It's not painful and I'm not spotting or anything...but I'm scared because we're on a long road trip and I've never been pregnant before. Could the vibrations be dangerous or not even matter? Is the cramping normal?? I may wind up going to doc when we get to our destination...but someone answer just to get my head right please