Cramping??

A

I’m 11 weeks & cramping on one side. I’ve already had an ultrasound at 6 weeks so no chance of ectopic. No bleeding or anything. & babys heartbeat is still strong on Doppler. Is this just from my uterus stretching?? It’s kinda dull but It’ll hurt a little more randomly & it also kinda hurts in my lower back like right at the top of my butt on the right side too. I know cramping is normal most of the time but i just worry with it being one sided