My doctor calls it "rupture your membranes" but I'm guessing that is the same thing as a sweep as you all are calling it. I went in for my appointment and baby is measuring large and she offered to do a sweep and I'm so happy! I'm 2cm dilated and 80% effaced. She said it looks really promising since I'm really ripe! It didn't even hurt that bad. I've started to get some strong contractions so I hope they keep up!