Yes you need an attorney. In Maryland, when the court learns of a possible violation of probation the usual course is to hold a hearing.  Revocation of probation and the imposition of a more severe sentence are real possibilities. If you received a suspended sentence or a “split sentence” (imprisonment both imposed and suspended for different periods), the court may also impose any term of imprisonment which it had previously suspended, or some fraction thereof. Discuss the possibilities with your lawyer.