Hi Cherii
I know of a good accupuncurist in Brisbane that has much success with inducing labour if you want his details.
How are your sugars? Are they well controlled? If so even waiting another week might make all the difference. 38w is quite early (as far as your body and baby are probably concerned) to be trying to force things if it's a "just in case" measure.
I had insulin dependent GD with my first bub so I know all about the "drill" you go through with it...it can be very hard to hold things off I know. Good luck.