Bit scared that my Doctor wants me to have C section at 37 weeks !

Sally
My baby is Breech and hasn't been head down once and doctor has said its due to previous scaring he can't get down. 
  I've got my head around having to have a c section but can't see why it has to be at 37 weeks? Isn't that too early ? He says he doesn't want me going into labour early. This is my second child and my first boy was born on due date.
Do you think I should just say no?
Any advice gratefully received!
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