I've been crampy early on with all three pregnancies. Particularly with #2 I remember. I remember wondering if it was my CS scar stretching. It went away and soon turned into round ligament pain, but I distincly remember that pulling feeling.
oooh so glad lots of you are feeling this too. This is #2 for me, and I certainly did not have feelings like this until much much later last time! It makes me realize I will likely be showing a lot earlier too, if things are already stretching!!