Growth scan - 36 week ultrasound

I am a thin framed woman and have been told the last 2 appointments that my fundal measurement of my stomach was measuring too small. So my dr ordered a growth ultrasound to make sure baby was still growing. He definitely is!! He is the size of an average 38 weeker estimating his weight at 7lbs8oz. I was so nervous when they ordered it but feel so much better now!