Growth Ultrasound?

Heather • Momma of 4. Love making new friends feel free to follow! (:
I'm 33 weeks and 5 days and my doctor hasn't scheduled or mentioned anything about a growth Ultrasound so I asked when I will getting one and she told me I won't be. She said the last ultrasound is at 20 weeks unless she expects something to be wrong with me or baby. Is this normal?