Question about Measuring tummy ..

I’m 24.4w at my next appointment I’ll be 25.5w where they will begin measuring my tummy for weight and whatever else they measure for so my question is my tummy hasn’t really grown since I’ve became pregnant at best I look bloated I’m still wearing my clothes from before I was pregnant looking at me no one can tell I’m pregnant! (ps. My baby is measuring on time so she’s definitely growing in there)