Help dilating more?

So last time I was at the doctor was a week ago and I was 3cm and about half thinned. What can I do to help dilate some more before I go to the doctor on Thursday? Here in Nc if you're at 4cm they usually keep you in the hospital and say you're in labor. I've been walking a ton we have had sex and I've been bouncing on an exercise ball what else could I do? I've already been having contractions on a daily basis they get stronger but not necessarily closer together or more consistent