Half way app/ultrasound!

Kayla • Wife. SAHM of 3 💗💙💖 #4 Due may 2022💛
Had my gender and half way app today I'm 19weeks4days and my girl is measuring at 20weeks1day and weighing about 12oz! I asked if my due date was gunna change they said they don't really change it unless it was my first ultra sound, Is that normal?  Do you think I'll go ealry since she's already that big! He said she fine tho