Whatever you do, do not let them tell you they are "moving you up to the jumpseat". You do not give up a PS seat on the airplane for the jumpseat. They can't make you ride in the jumpseat. You should also not be bumped from the flight, you are positive space, after all.

I got told I was being "moved to the jumpseat" and I refused, and then she said I could get on the next flight and I told her that would make me late for training. No worries, I said I'll go home and call Pilot Service Center and let them know the CSR bumped me off my PS flight.

Magically she found a seat for me.