I think Jennie hit that nail on the head. The true message is looking within you.
That said, I had many ctx that were as close as 2-3 mins apart with my DD as far away as 6 weeks before she was born. Sometimes it's just what out bodies do. It may actually mean very little for when your babe will be born.
And, I know that many early babes have been UC'd with much better outcomes than if they were born in a hospital! http://www.unassistedchildbirth.com/ubnews2.htmhttp://www.unassistedchildbirth.com/diane.htm
I know there are more stories out there about UC Preemie births, those are just the only two I can find right now.