I had one at 38 weeks but only cause my cervix was very ripe and favourable and due to a lot of pelvic, groin and back pain (in both my pregnancies) I agreed to it - enthusiastically I might add! I was over it by then plus DD2 was due on 28th Dec and I wanted to avoid a Christmas delivery if I could. I wanted to be around for DD1 (who was 2 then) at Christmas. My waters broke 4 days later and DD2 was born within 45 minutes (37 according to my midwife) - a week before Christmas. It was fabulous!

A S&S doesn't always work or help and you can most definitely say no to one. It is an easy way to possibly get things going if you're ready to meet your baby.