need some input please ❤

I have a 12yr daughter so was pregnant 13 yrs ago and I am now pregnant 21w. Also I'm a plus size mumma at 266lbs a lot I know.. so my question is shouldn't I be feeling more and more kicks and harder.. baby's fine had a scan last week and it's a boy yay.. have scan Friday to,, I've been feeling flutters and few small kicks low down.. I guess I'm just worried as haven't been pregnant for a long time and don't know what's what.. can anyone shed some light or advise me please x