Petite mums?

Lesley
Hi I'm 16 weeks pregnant and 125lbs (8 stone 13) pre pregnancy I was 122lbs (8 stone 10).
I'm not worried as such but when it comes to feeling the baby move, my husband seeing the baby move, my stomach moving etc. I haven't got a bump. Or anything remotely close. 
I'm just wondering. Any small mums who stayed small have any problems with this? Seems a dumb question but the thought of my stomach moving and seeing kicks against a flat stomach seems unfathomable to me. 
(Please no comments about how I might "pop" etc, I already know this is a possibility.)