When did you go into labor with a big baby?

So babys been measuring 2½ weeks ahead overall some things like her legs and head were 3½weeks ahead since 20 weeks they are estimating baby to be 9 to 10lbs she was 7.1lbs and 93% at 35w I'm having a scheduled csection at 39w5d did anyone go into labor early with there big babys and if so when!! Thank you in advance i have a 2 to 3½hrs drive to the hospital depending if my husband's home so I'm a little anxious