Im 6 months and only look about 4 or 5 months. This is my first pregnancy though and apparently every woman carries differently. I think its perfectly okay that you arent that big. As long as baby is healthy, I wouldnt worry. (:
Everyone is different,on my first i barely looked pregnant at 9 months and baby was 8lb6oz lol,its not a bad thing at all youre probably carrying baby more to your back thats all,as long as the pregnancy is goin smoothly and doctor has no concerns i wouldnt worry :)