Hello! Something is worrying me, more precisely its size and growth ra…

Hello! Something is worrying me, more precisely its size and growth rate. The tenth week and the belly seems bigger for this term ?? I eat a little bit, at night if I want to eat I drink warm milk or kefir, I don't eat bread and sweets anymore for five years and still it doesn't pull? Healthy fats, fiber, iron and so on. I get them from food (I am very careful and buy only fresh homemade everything). At the ultrasound (at the eighth week) showed homogeneous pregnancy. Why is my belly so big or is it normal at 10 weeks? My constitution you know... I am small in stature and weight average 47-48-50.