Short long bones (arms and legs)

27 weeks and my MFM dr (high risk for other reasons) told me my baby girl is a week behind on her long bones. Her arms and legs a measuring behind. Dr said she is not concerned, but I am! 🤢😩 she also does not recommend testing because everything else is measuring perfectly fine. My husband is 6’1, I am 5’4.. and my first born is always on high 98 percentile for his height. I got super worried and I hope things don’t get worse 😩

Has anyone experienced the same and what was your outcome? Thank you