Has anyone had any experience with a possible loss in velocity of growth of their baby (particularly abdominal circumference) in third tri?

At 24 weeks baby’s abdomen in particular was in 70th percentile but at 32 weeks was in 43rd percentile. OB has sent me off for another scan at 34 weeks to see if original measurements were off… but has prepared that there may be placenta issues resulting in restricted growth and we may need to make a plan depending upon results of next scan 😢 (close monitoring of growth and maybe early birth)

Feeling really anxious about baby not growing. Not sure how these things are even picked up as most women don’t have ongoing scans (I only had one to check placenta location from cervix: which is now fine)

Thanks in advance.