Gestational age in ultrasound ahead in schedule?

I'm due November 23 according to initial calculations made by my doctor with my menstrual cycle. This makes me 17+2weeks pregnant.

However my last ultrasound recorded the gestational age as 19weeks.

Is my baby growing ahead of schedule? Am I delivering early? Mommas please help.

It's my first and I'm confused and overwhelmed. Any mommas on the same boat?