I was the same Jemima, and boy you should have seen me during pg no 2 when I was bfing as well! I ate enough for a whole army LOL!

I don't think it's anything to worry about, it's probably just a sign that you need more calories to cope with growing a fetus and running around after older kids as well. Did you lost the weight easily after your other pgs? I know my weight fell off when bfing. If you lost the weight easily, I wouldn't worry at all. If you didn't, I still wouldn't worry about it yet. Your body is telling you something and the best thing you can do is listen. Maybe once you further into the pg if you have put on a lot of weight, you can look at changing the types of foods you eat. But for now I would go with the flow.