How to start labour?!?

So this is my third baby and because I have gestational diabetes and on insulin they will be starting my labour Friday March 15th 38 weeks and 6 days. Today I’m 37 and 6 days but when my doctor tried to do a membrane sweep she said my cervix is still too high for her to reach. That being said I’ve had the gel before with my first and the pain is excruciating, my second I tried castro oil and it worked. I really wanna start this labour before being induced a week from today (castro oil is sooo out of the question). If anyone knows of anything on how to start it please give me a shout.