Measuring small

Megan

Hello! This is my first pregnancy, everyone is always telling me how small I am for 35 weeks. Today I had a prenatal appt and the Doctor said It my be because of my size pre pregnancy. He scheduled an ultrasound in a week to check fetal weight and growth. In the after summary visit it says “fetus size inconsistent with dates in third trimester”. Has anyone had this happen to them? The doctor didn’t seem concerned but of coarse I’m freaking out.