Measuring 2 weeks ahead

Ashley • Happily married for 4 years to high school sweetheart and my Marine . Have one 2 year old son and Expecting little girl!
So went to the doctor today for an ultrasound baby is measuring at 34 weeks belly at 33 and I'm only 32. But they will not change my c section. I am not having a vaginal birth I can't handle it because my bp will not allow it. Wondering why they won't change my c section date? This is my second so I am just very frustrated.