Dilation question...

Amy • I'm 28 and married. Trying to conceive for 8 years and have PCOS. My baby girl is due December 18th!
Had my 36 week appointment and I'm not dialating at all yet... I go back on Tuesday, is it possible for someone to go from nothing to like 3cm in a week or does it happen slowly. I know all women are different, but just curious if its happened to anyone.