How to start labor?!

I am almost 35 weeks and I am measuring about 3 weeks ahead and she is over 6 lbs already 😳 but she is doing great on her breathing and very developed. my dr said it would nice for my body to go into labor at 36 or 37 weeks because she’s so big but he said he can’t induce me until 39 weeks. I don’t want her to be too big for me to push out because I’m only 5’2 and a small person 😭 how do I make myself go into labor?? I have a pregnancy ball I’m using and my hubby works nights so we our schedules are pretty opposite so we have sex about once every few weeks. How else can I help the process along?? (And no castor oil😂) thank you!!