My bub is measuring ahead also, was in the 90% but has dropped back to the 80% now, lol! I have a cs booked on the 16th also and I had the same concern as yourself. For me, they are not bringing it forward..... Bubs is healthy and doing fine. My advice is to rest up and try and relax for the next few weeks. If bubs decides they want out of mum, then you will know. Good luck!!