What is your question?

And are you sitting in jail yet ?

Did you call the very next morning, or go sit right away in the lobby waiting to see the PO

There is no valid reason for missing your probation appointment except being in the hospital or dead. You need to contact your PO immediately and give him whatever lame excuse you have for missing your appointment. Then you will have to attend a VOP hearing as you violated your probation by not showing up at a scheduled probation appointment.