Completed Community Service Letter In California, What Happens If My Probation For My DUI Is Revoked?

In California, what happens if my probation for my DUI is revoked? - completed community service letter

I have a DUI in California last year and it was my first offense. I was given a fine, DUI classes completely pay goes to AA meetings to go to MADD, and comprehensive community services. I totally screwed and I forgot to do my civil service of the deadline. Now I have only received letter that my words will not be returned, and I have to go to court this month to attend a hearing for violation of his probation.

Does anybody know what are the consequences could be this?

Should I go to jail?
Would you give me a chance to make peace?