I Had 5 Shots Of Lupron, My Last Shot Was

I had 5 shots of lupron, my last shot was nov 19 2015. Dec- jan no period then feb 1-5 took duphaston as per my doc instruction, its been 17 days since my last duphaston tablet and still no period. Had dark brown discahrge on feb 14-16 and still no period came until present date. What could have happened on my regular cycle prior to my lupron? When will get my cycle back?thanks