Stretch and sweep?? Do you actually see the membranes on the doctors glove?? Does it actually hurt?? Needing some answers..

I might be given a stretch and sweep next week and I’m quite nervous but eager for it to work! I’m wondering how I will know if it’s working at the hospital? Do you actually see the membranes on the doctors glove?? I’ve heard it’s just stripping your mucus plug, so do you see bits of plug? Does it always hurt??