Sounds like the sweep worked :) i had it done on my 40 week appointment and by next evening i was in hospital to have my son. I had absolutely no feeling of labour before then, my first came naturally a few days before 40 weeks. Good luck! Keep an eye out for the show/ pink mucus.. I found it quite alarming lol
It could just be from getting your membranes stripped... I get the same way and I've had mine stripped twice, second time it took over 24 hours for the cramping to let up... start timing your cramps though, it might be labor, you never know :)