My OB told me that most women will go into labour 48hrs after S&S.

I had one on tuesday morning (had tightenings straight away) but didnt have DS until thursday morning 46hrs after S&S hehe. She did tell me at the time of the S&S that she would have been happy to break my waters so my cervixs must have been very ready....

Best of luck and i hope you get the birth you want!