Worried mummy

Hi fellow mummy/mummy-to-be! I'm currently 17 weeks pregnant, but my weight doesn't seem to be increasing and my bump is also barely visible. My friend is due 2 weeks after me (also first pregnancy) but has a much bigger bump. And although my nausea has gone, my appetite havent increased and I am eating even much lesser than pre pregnancy. I'm not sure how baby kicks feels like but I occasionally feel a pressure at my lower abdomen. I understand that everyone is built different but I can't help but to worry that my baby have stopped growing. It'll be good if I can clearly feel that my baby is moving inside me, then maybe I would not be so worried. Should I bring forward my gynae appointment due to the concerns? #1stimemom #pregnancy #firstbaby #advicepls #pleasehelp