Hi Mumma Bear
I too had the cramps and even back ache. They have eased off a bit now but still come around every now and again. I've been told that it is very normal and someone mentioned that it could be my uterus stretching. (Don't ask me why its so much seeing as bubs is only 1cm long or so)
If you are still worried then have a chat to your doctor.
Good luck and take it easy