I had a stretch and sweep done with my 3rd pregnancy, I had some blood mucous discharge in the afternoon and that night around 11pm I started to have painful contractions, I went and had a bath and then went to bed, when I awoke in the morning I had to be at the hospital at 6am for an induction, the good news was I didnt need the progesterone gel as my cervix had already started dilating, so I just had my waters broken.
You may experience some blood mucous discharge after the stretch and sweep, and you may experience some contractions, sometimes this is all women need to get their labour started, sometimes they have a bit more intervention
Good Luck I hope it works for you