I have my OB appt today at 10:50. I'm 39 weeks 2 days with my first, I'm 2-3 cm and 70% effaced that…

I have my OB appt today at 10:50. I'm 39 weeks 2 days with my first, I'm 2-3 cm and 70% effaced that i know of. Should be getting a membrane sweep today. Anyone have a good experience with it working with the first?