I am 26 weeks along and really have no reason to worry other than that I had a low BMI when I conceived. I have gained almost 13 lbs so far. Did anyone else begin to have this sense of panic right before their third trimester?
Don't worry, I also had a low BMI on conception. Wit DD at my booking I had a BMI of 13!! Usually 16.5 BMI, so that was just the morning sickness making me loose more weight! I went to a dietician on the advice of the MW and she said that the fact that I conceived naturally and had regular periods was a good sign that all was well and there was no danger from my weight. She never said that low weight would cause pre-term labour.
This time round my BMI was still underweight for my height and until 28 weeks I'd only put on a stone, but since then I've put on about another stone and a half!! Your body will gain what it needs and you'll probably find that as you were slim before, you'll loose it all quickly too !