FTM. Relatively small tummy at week 19 and anxious about next appt

I know different people may have different growth pace but it goes get stressful when people around comment that “you don’t look pregnant” “your tummy look small must eat more” cos my tummy is not as obvious as the other preg mothers. Comments like this make me worry in between my appts.. my last appt was at week 16 and the next will be in another weeks time. Doesn’t help when there’s so many information out there about stillborn etc which can’t be detected until scan Anybody encountered similar and how do you deal with it?