My question involves criminal law for the state of: VA

im 20 years old and go to school in virginia. Last spring i was charged with underage possesion and drunk in public, and it was my first offense. I was given probation for a year, complete a class, and 50 hours of community service to complete by sept 1. Stupidly i did not complete all my hours in time, and now have a show cause, which i gather is i return to court to look over my case again. My question is what can i expect? To me it seems ridiculous to recieve jail time or this, though i realize i did not completely abide by the punishment given. i have passed all drug and alcohol tests, and completed the class, and have had no subsequent infractions for anything. what do you think will happen?