I was 4 cm with no contractions for literally 4 weeks before I gave birth (from week 36 until my due date). I don't know how much it helped, but I tried eating dates, eating pineapple, sex, and moderate exercise (walking & prenatal yoga). My contractions started the day before my due date and my little guy came right on time--no sweeps or induction necessary (which I was scared of).
Tuesday, the 8th I was about 1 cm dilated and 50% effaced or so. By Saturday, I was 4 cm and 80% effaced when I went in for my induction - so I did not end up needing to be induced. The day before that (Friday, the 11th) was the first day I was off work for leave. I had a ton of errands to run. I felt great, so I ran them. Made it home for lunch and the contractions began... for me, I think being active that day helped it get going. I was 39 weeks, 6 days when I delivered (early early Sunday, the 13th).
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BFP#1: 01.06.2015 ... Baby Boy Due Date: 9.14.2015 FTM!
Re: 4cm and no labor