I wouldn't stress over it. I don't think those ranges of what is supposed to be "normal" is a large enough range, i know so many woman who go over or under. It can depend on a lot of factors some woman retain fluid. Its hard to say. My midwives and Ob don't even bother weighing woman anymore because so many woman stress about the weight they have or haven't put on. As long as everything else is going okay and bubs is measuring up fine, heart beat good and all those things I wouldn't worry. If your Ob thought there was a prob he/she would have mentioned it.