Louise I have a high BMI and not sure how much I have gained so far, but gained 4 stone by the end of my pregnancy with Holly, so that's not true for me! I lost all the pregnancy weight really easily after the birth though without doing anything which tells me it was mostly water retention, so I think it has a lot to do with whether you are prone to retaining water or not x
From what my doc said, healthy weight gain is 25-35 lbs. They also said for me, due to my weight loss in the first tri, I probably won't gain more than 20-25. At this point I'm still at -5 lbs or do, but gaining quickly now! Kind of thinking I should slow the eating down... My almost empty bottle of Tums would probably agree!