Mine was swept today and currently having contractions!
My daughter was due December 31th of 2012
My doctor did my membranes on the 27th around 1-2pm, I went to the hospital at 4 to be checked for dilation, next thing I know my daughter was born at 4:05am on the 28th
It took me a few days but it could be anytime, you never know your water could break. Be ready..
I didn't go into active labor after having my membranes swept. They did mine on my due date and ended up inducing me 3 days later because the contractions were terrible but I wasn't progressing.