it sounds like you are travelling along healthily and given the responses in this post it just shows how we are all different! personally at 25 wks I have just weighed myself and I have put on 4.5 kgs. My OB doesnt weigh me though (except at first visit) as she says everyone is diff and as long as baby is growing and i am feeling healthy all is fine. so i would not worry as long as you are not suffering and baby is growing well. I think it is great that everyone's body reacts in a way that is right for them and their baby. GOOD LUCK!