Growth scan ultrasound at 39 weeks?

🌻P

Went in today for 38 week check, baby is very low, dilated at 2cm, and I’m 80% effaced. I’ve only gained 25-30lbs and I’m usually measuring a week or so behind but I also have a long torso… today my midwife wants me to go in for a growth scan to check fluid and her size… I can’t get in to do it until Wednesday… I’ll be 39+3 at that point. Anyone else have a growth scan this late in the game? Any thoughts?