short measurements

I posted this awhile back and I guess I needed to hear some more stories/reassurance. While the head / brain / spine all measure fine , the arms and legs are measuring a few weeks behind. All my bloodwork has come back normal and she does grow, it's just like those parts are behind. Even though the Dr says" don't worry it's probably just the size baby you're supposed to have" I of course worry like no other and I have to stay off of Google because it can be unkind. Anyone have similar stories that turn out fine ? Thanks in advance 😐😐😐😐