Membrane Scrap Success?! FTM

I'm 38.4 & go into tomorrow for my apt I wanna ask my OB if she will scrap my membrane - last apt I was 1cm & 20% effaced but I think tomorrow I will have progressed - he dropped a lot & lost some of my mucus plug over last few days ... I've been contractions for weeks and it always fizzles out . Any advice and or stories ?! Praying my OB will do it and it gets the process happening