I would be worried about early labor. It's possible for you to not even feel that you're dilating, you're just suddenly in labor. Did your doctor mention a cerclage?
I would imagine ur doc would keep checks on u to be sure that u aren't dialating to much. If their not worried I wouldn't be
I wouldn't worry I have a family friend who would always dilate super early and go past her due date. Everyone is different but I wouldn't worry.
At the same time though you could only be dilated to 2cm to 40 weeks and still nothing. Everything is a little different
I would be a little worried because you shouldn't be dilating until your closet to delivery