JBM - your doctor is an idiot. He would have copped a mouthful from me for saying anything like that. One of the things I have found best to managed weight whilst pregnant, is not to just cut out junk food etc, but to make sure I am eating all the different food groups. A pregnant woman from her second trimester should be consuming:
3-5 serves fruit
6-8 serves of vege
3-4 serves of dairy
2 serves of protien
carbohydates at every meal (equivilant to approx 5 serves over the cour of the day - preferably complex carbs, so the grainier the better)
2 teaspoons of a healthy oil each day (ie, olive oil, flaxseed oil, sunflower oil, etc)
8 glasses of water

I find that by the time I have consumed all these things (especially fruit and vege which I use as snacks and to bulk up every meal) I am so full that I naturally don't tend to eat junk food as much, or overeat on the other foods (such as carbs).

Peannutter - it is hard when you are feeling nausea. Sometimes all you can do is eat anything to try and keep the feeling at bay.

Well, I went a little off track yesterday. OK, so I had a complete blow out. I took the kids to the movies to see cars2 last night with DH before he dissapears with army for a couple of weeks. I didn't buy anything for myself to snack on, and I didn't intend on mindless munching - but I still managed to eat my way the most of a pack of starburst rattlesnakes and a big packet of twisties. sigh. At least I was so good the rest of the day prior to this and only had a salad for dinner. But I actually felt a little ill for eating so much junk food all at once.

But today is a new day.