I think I answered elsewhere the same question. Be honest with your attorney, don't lie to him or court. You'll be able to request more time. Your pregnancy condition may also be relevant. Good luck
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You need to be honest with the court but don't expect them to be sympathetic. Bring proof that you attend school full time. That is you best excuse here. Pregnancy is unlikely to get you anything since its common. The same with working full time. Mention all three, but school is your strongest excuse here. If you got good grades then even better. Good luck.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.
You asked what can happen. First, the judge can give you extra time to complete the community service and not find you in violation of probation or revoke your probation. Second, the judge can find you in violation of probation and remand you into custody, although this is unlikely. Third, the judge can give you extra time to complete the community service, but add more community service to your obligation. Fourth, the judge can modify the terms of probation under Penal Code section 1203.3a to eliminate the community service requirement, but this is very unusual.