36 wks- small belly measurement- anyone else?

Katie • I have two amazing boys ages 6 and 2 (in March). We just found out our princess arrives June 10th.
At my 34 wk appt I measured 2 cm (have been behind all pregnancy) but today at 36 wks I measured 32 Again so they ordered a growth ultrasound for next Friday to make sure she's growing properly. I'm trying to think positive and that its just due to low weight gain because with my boys I was bigger and at 32 weeks she was measuring perfect. Anyone else have this? I need some good vibes
Here's me at 36 wks (21lbs gained)