Quoting vxgonzalez:" <blockquote><b>Quoting MrsDores:</b>" I second this! At 39 weeks I was not dilated ... [snip!] ... at 39w4d my water broke and I was at a 1 and 50%. Changed so fast!"</blockquote> Our bodies just know when it's time."
Spot on, mama.
Here is a great article for anyone who worries about cervix not being ripe enough to mean that labour is still far away...
The reasons outlined in the article are exactly why they don't do cervical exams in the UK or Australia during pregnancy.