I had the opposite worry I was 10 2 when got preg n im now 10 13, I worried there was something wrong maybe that I hadnt got enough fluid or something but she said everything was fine. Everyone is diff n as long as baby is ok dont worry. If its any conselation I wish I was bigger as I have terrible rib pain where he is kicking n I feel everything, I cant sleep because its sore where ever he is laid. If I was bigger I would prob not feel as much. xx