I've been looking at baby-gaga.com's pregnancy models and im in week 13 of my pregnancy, but my belly looks nothing like theirs. I dont really look pregnant at all, just chunky.
Answer on Why isnt my belly that big?
Everyone looks different during pregnancy. It also depends if this is your first pregnancy or not. I didn't show for quite awhile with my first, my second, I popped out right away. No need to be concerned as long as your Dr isn't.