I'm a pretty sporadic poster, but I just wanted to include this as encouragement for anyone else who was told that they might be a little "small" based on belly measurements.
I had my growth scan yesterday, and based on measurements taken from that, baby is just where s/he needs to be. My OB said that even though my belly only measures around 27 weeks, and I am almost 34 weeks, the ultrasound showed that everything is fine and she is not worried at all. Some people just have small bellies!
So, anyone who is waiting on an answer to something similar, hang in there! I am sure your babies are just perfect! :)