What about your local Labor and Delivery ward at the hospital. They might be able to check you out.
my next appt is May 22nd and the last time I went to the doc she had had checked me and I was 1.5cm dilated amd 50% effaced and all she told me was to stop picking up my 20 month old son and thats it.
I would go get it checked out just to be on the safe side.
it doesnt hurt to go get checked out at this point...better to be safe than sorry...