stretch and sweep?!

I had a stretch and sweep done at the doctor today, She told me I would have some light bleeding, I know this is stupid because she is the doctor, but I've yet to have bleeding of any sort, light or dark, and no uncomfortability. I know that it's 50/50 and it probably just means that it didn't work this time (sigh) but I also walked 5 miles today, used the exercise ball for 30 minutes, and did 23 squats. So I guess my question is, do you have better chance of the sweep working if you put in more exercise and energy?