Sacha-- no to the gestational diabetes.
But i just wanted to point out something youa re probably VERY aware of already..... you only need an addition 200-300 cals a day during pregnancy, the quivalent of a serving a peanut butter. Thats it. (assuming you are getting a good nutrient profile, which im willing ot bet you are)
After that, it comes down to will power and self control for you--> two MORE things i know youve got mastered
On the other hand, i realize how psychologicaly easy it is to let self-control fall away when pregnant, because it IS a good "excuse", not to mention more intense cravings (possibly) and more people trying to pressure you to eat crap at parties and whatnot.
If it makes ya feel better, i gained 72 pounds with #1