You really never know. I was 4 cm and 80% effaced when I went in to be induced at 41 1/2 weeks. They broke my water, and an hour later, still nothing, so I had to be put on pitocin to get labor started.
Never let it go longer than a week other wise there maybe something wrong happening to the baby. I had a C-section done for me because they found that I had a high blood pressure problem and never dilated pass 4 cm. I would go to your doctor about ASAP.