You definitely have the right attitude. Call your PO and just ask. They usually will work with you on situations like that. I know several personally. What you don't want to do is just not show up. If you explain that you need to do it early, I'm pretty sure they'll let you.
Make sure you pay your fees on time, and if you can pay any fines, assessments with the Court off early, you may can get off probation early.
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Call and ask your PO politely and explain the problem. Most POs want to work with you to retain employment.
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