Uy, normal lang yan sa early pregnancy, lalo na around 7 weeks! A few of us went through the same thing kaya gets ko ang worry mo, pero since wala kang bleeding at okay naman ang ultrasound, it's usually just your uterus stretching at adjusting sa baby, sometimes it lasts until second trimester pa. That said, if the cramping gets worse or may bleeding na, better check with your OB agad lang para peace of mind mo talaga, kasi mas better safe than sorry when it comes sa pregnancy!