Measuring big? Help!

I went in for a growth scan last week to see how our son was growing as I have measured at least four weeks ahead of schedule the last two visits. I know growth scans are not completely accurate, but They measured him at 35 weeks (supposed to be 31). This would move my due date to August 26. 
Should I be hearing something from my doctor to confirm these readings or schedule an earlier appointment? My next appointment isn't until August 6 and that would put me at 37 weeks. Makes me a bit nervous if I am that far along and not seeing her until The 6th. Not sure if I should call or wait to hear something. The scan was done Thursday of last week. Any advice? I appreciate it ladies!