Awww try not to let other people make you worry! People love to have a comment on everything, and dont realise how stressful it can be!
I think you look just fine, you will probably find your belly 'pops' in the next months or two

I think the pain you are feeling sounds normal too... there is a lot of stretching of muscles etc, as well as organs being squashed to make room, going on in there. Just ask about it at your next check up, but it sounds pretty normal to me.