I'm 19 weeks today! Congrats! :) I feel the flutters, no kicking yet. But its my second.
I mean I've felt what I think is flutters or gas, lol. And I could swear yesterday I felt some little pops or something when my bf was touching my tummy.
Your size will only impact you visibly seeing the movement from the outside and that might not even be the case a size 16 isn't that big. Even if you don't remember the flutters with your first two every pregnancy is different. I hope all goes well at your visit and I believe that everything is fine.