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I\'d recommend you to contact an attorney in this type of situation. In my case, I filed my own I-485 in 03/99. I got married in 10/99 and had my wife enter the US on H4 (my H1B was valid at the time). In 02/00, my attorney filed a DERIVATIVE ADJUSTMENT OF STATUS application. As far as I know, it was the same type of application as would be submitted for a spouse had we applied together at the same time, as most of the married people do. The only thing that was different, in my opinion, was that on the accompanying letter to the application, it said "FOLLOWS-TO-JOIN" in large letters...
Anyways, I have my approval already, but my wife\'s case has it\'s own timeline, of which this FP notice is the most recent development...
Once again, I\'d suggest to get lawyer\'s help on this...