I've had it done at 39 weeks went into labor that day had my baby that night.
With my first i had a membrane sweep at 40wks 3 days and than 3 days later my baby boy arrived.
Had mine done on Friday, went into labor Monday morning, also had sex:)
When I had mine done I scheduled an appt for the following day. I started having contractions soon after and 12 hrs later my son was born