at this stage it is prob just bloating.... try not to worry too much about the weight gain - if you exercise and eat relatively well (i have been much naughtier than usual - i cant hlp it) you will only put on what you/bubs need. I have, so far, put on about 6.5 kgs (am 30 wks) and there is lots of time to lose the weight and worry about it after bubs is born.