Labor

Miranda
Today at my 20 week ultrasound, my doctor told me that baby was measuring a little big. I'm pretty small at 5'4" and 118 pre pregnancy. Does this mean I won't be able to have a natural birth?  
My mom was just as small as me, if not smaller, and she had 5 kids naturally.. Ranging from 6 pounds to 9 pounds. I'm just super worried that I will have to get a c section when I've been working so hard to have an all natural birth!