I gained weight very rapidly starting at about six weeks, with my twins. I was sick a lot, and eating was the only thing that helped me feel better, so I ate-- constantly. I gained about a pound and a half a week well into the second trimester. It's a good thing I did, too, because in the third I gained almost nothing. The babies were so huge and taking up so much space that if I ate more than the tiniest amount I felt stuffed, and the heartburn was terrible. I had to really try hard not to LOSE weight in the last few weeks, even. So I was really glad I gained so much earlier.
If eating helps, then by all means eat. Stick to the healthiest choices, keeping in mind that your protein and fat needs are increased. I drank like a half-gallon of milk a day for the longest time with the twins. It just felt good in my stomach, and I think our bodies have a sort of wisdom about what we need.
me , he , my three , , and -- and the one we lost