Don't worry too much about that little gain... as you've already done so fantastically, so can do it again! That's wonderful that you're now working out with weights... but just keep drinking lots of water, as I've noticed that I often gain in the mornings if I've been working out and haven't drunk very much. Keep measuring yourself too though, as you'll be amazed at the inches that you will lose from that training. You just keep up the great work though and you will see results! ;o)