Had 2 sweeps with each of mine. First at 38 weeks. It didn't hurt during but some mild cramping after. Second sweep successful on both. I was very pleased I had them! Why are you having it early though? Best to wait until 40 if nothing wrong
I would decline until 40 weeks. Baby is bigger and more developed. There is no need for you to have it early by the sounds of it. Get her to book you in for 40 weeks. My first one was done early as I had medical issues but meant baby smaller needed more feeding to catch up etc.