As others have said on previous threads, the crystal ball is out for repair.

If your probation has been without incident thus far, you will probably get a tongue lashing or at worse, made to sit in jail for a few days.

If you have other issues with the PO, then you might be revoked and put into federal holding, while the revocation process works itself out. A supervisor could put a stop to it, or the judge could.

My suggestion is to be polite, apologetic, etc.