Yup. I read about it in the Wall Street Journal. The kicker is that you don't want to go to the hospital too soon, or they'll pump you full of glucose and the contractions stop. (Learned this the hard way ...)
Well, as a fyi, how much do you fast, how long, and when it did start, did you eat anything? I'm not sure starting a 18 labor on zero fuel is a good idea..