We are having a girl!!!!!!!!!!!!!

I am over the moon! I wanted a girl so badly

One thing that was concerning is she said that I was measuring 8 days behind. I have read that anything over 1 week is a concern?
She did say that the baby was in proportion and it just may mean that it may just be a small baby. Me and my sister were both small so maybe my bub is the same? Any insight to this? Should I be concerned.

Also what causes the baby to measure behind or be small?

Thanks girls we are so excited we have a Princess on the way!