Probably not.  Generally speaking you have to complete all the requirements under your sentencing and then most states put a time factor in to their expungement law, i.e., stay clean for 2 years, 5 year - whatever.  Here is my concern: if you did not complete all the requirements you could have violated your probation and there is a warrant for your arrest issued somewhere.  I think that you need to speak with a criminal defense attorney as soon as you can and to have him or her check and see what is up with your case.  I would not wait any longer and risk finding out the hard way by being hauled in.