Light cramping-pregnant?

I have been cramping very mildly for the last two days. It doesn't feel like period cramps, it's more like a gentle squeeze of my uterus. Also, I've had some lower back aches along with these cramps.
I have another week and half before I can test, and there is a great chance I am overanalyzing these "symtoms". But I'm wondering, how many of you experienced cramping as an early pregnancy sign?