Re: uterus expanding...
Hey Cee! How are you? I wouldn't worry about the mild cramping, my sister went through the same thing, and they said it was her uterus expanding. As long as there isn't any blood or excrutiating pain, I wouldn't worry too much. But if it would ease your mind, you can call your doc. Just wanted to let you know that my sis did experience this early in her pregnancy as well.
Just in case you don't remember the posts about my sis, she went through IVF and is now 3 1/2 months pregnant with twins.