Thank you girls for your input. I have recently moved interstate so this is a new obstetrician who hasn't met my DH yet and is not really familiar with my previous pregnancies.

I wasn't too inclined to be concerned...I actually put on less weight with DD and yet she weighed a whole pound more than DS.

I don't think the OB was too concerned either really, like I said in my original post she wasn't implying I gorged myself, I'd say she was just suggesting that watching my diet might help me because she clearly expects another big bub.

Given that I'm actually a bit heavier to start off with this time around with this pregnancy, that's already motivation enough for me to make sure I don't eat too many pizzas and chocolate biscuits. Vanity...