She is growing too fast !

Went for 20 week appointment and doctor said I was measuring a bit big for where I was so sent me for an US. told me it wasn't a massive concern since I am very short and petite and baby just might not be taking after her mammy that way. Well I go in for the US and my little princess is growing about 2 weeks ahead of schedule ! Should weigh about 10oz and she weighs a pound ! I've only gained 4lbs so far lol. Anyone else measuring big or ahead of schedule ? I've heard sometimes they move your due date but in still on for March 19. Here's my beautiful girl, Saoirse Rose !