Additional ultrasounds to monitor growth

K.
I had a low PAPP-a in my first trimester screen. It was borderline low. I had the NIPT (Verifi) test come back negative, and both my anatomy scan and my additional placental scan showed no abnormalities and a healthy placenta.
My doc has ordered me in for a 32 week ultrasound and a 36 ultrasound to monitor the baby during these final weeks. I have been gaining weight steadily but have not gained a pound in the last month, though my fundal height is bang on 28 for 28 weeks. 
What I'm saying is I appear to be totally healthy, and she's doing her due diligence sending me for additional checks. I should relax and not borrow trouble, right?
Is anyone else being monitored this way?