I used homeopathic blue and black cohosh, but my labor had sort of already started, it was just not going anywhere. If your body isn't ready, no form of induction, natural or otherwise, is going to work. If I were you, I'd try nipple stimulation and intercourse. If your doctor is pressuring you into induction, you can always refuse, or just not show up at the scheduled time. It's never too late to switch care providers. I know a woman who fired her OB while in active labor!