baby's stomach measuring small

Carolina
I had my 20week scan 2 days ago and the ultrasound technician said everything looked fine except that the baby stomach was measuring a little smaller in proportion to the head. She said my doctor will talk to me on my next appoint and decide if a follow up scan will be needed. My next doctor appointment is on Wednesday and I can't help but freak out a little. Has anyone here been to a similar situation? I don't even know what this could mean and couldn't find much info online. 🙁