im currently UTD with baby #3 and feel and look small. with DS i was small, then with DD i was massive, now im small again. i think if you're worried, definitely book in to get a scan done just for ease of mind. in fact the hospital i am going to now referred me to go, i think its their procedure, i'll be 37 weeks and they wanted to see how big baby was going to be. on another note, my SIL looked really tiny with both her babies, and both of them ended up being nearly 9 pounds, so baby could also be hiding as well! as for movement, maybe what the other ladies have posted? just try and monitor it, i find my baby is most active at night. hope things go well for you.