Did you have a membrane sweep with your vbac?

Did you have a s&s with your vbac or did you wait to go on your own? My midwife suggested to start them at 38 weeks and on. Just wondering if I should go ahead with it because I read there's a possibility of breaking water with the procedure. Although I had 2 with dd and it didn't do anything...I don't want anything to accidentally ruin my chances for vbac. Any experiences/advice? Good and bad.