Hi Cass,
Normally drs dont book you in for an induction until you are about 10d over, unless of course there is a medical reason for it. Is everything going OK with your pregnancy?
I believe stretch and sweeps are the lifting of the membranes away from the cervix and trying to get things moving a little. I had one during my induction when I had already started to dilate, and it certainly got things happening! My contractions immediately got closer together, and much more painful.
Normally they start these sorts of things when you are overdue. If you aren't ready to go, all it may result in is a few niggles in your body, which may just die off after a few hours. Or as he says, it could bring on labour!

If there is no medical reason to be induced this Friday, you are able to say no and put it off. While its exciting to be meeting bubs sooner than anticipated, often early inductions (actually inductions in general) result in a more painful labour experience and often end up with some sort of intervention - whether it be pain relief, forceps/ventouse or even a c/s.

Best wishes anyway - I hope whatever happens works out brilliantly for you, and heres hoping the sweep does get things happening for you in a more controlled, natural way