I had two s&s with ds3 at my request as they where harping on about csection and there was no way I was going to do that without trying everything first. The first one was at 39 weeks which dilated me to 2cm and the second one was at 40+3 and I started have contractions on the drive home. I do however think my body was ready as both times when I had them the docs said my cervix looked perfectly ready for labour. Good luck