As stated by many of us here, we each are different.
I carried my baby for 10 months, her head was already in the 'crown' and I still did not get any labor pains. The last time I went to the doctor, he finally realized that I could not normally contract, as the muscles did not get the signals from certain nerves to do so. Therefore, I went in the next day and got induced. It took only six hours for me to get my little bundle of joy, she's 29 now and pregnant with her first.
If you break your water, don't wait too long to go in even if you don't have pains, you just might need to be induced also, but it's no big thing, and has been safe for over 20 years.
At any rate, keep in regular contact with your doctor, have the emergency number ready and have your stuff packed.
Good luck, and let us know when you bring your 'bundle of joy' home!
