Uterus measuring small?

Megan • Happily married💒, Mom to 7(4👧 & 3👦)

So went for my doctors appointment today im 19+6. When they measured my belly for uterus measurement she said 16. She seemed a little concerned and put in for my ultrasound. Now ny hospital is a learning hospital so every time i go i see a different doctor. Maybe this is a factor. Should i be worried? Has this happened with anyone else and baby been fine?