Does Methadone Treatment cause you to have a longer time between periods as a women?

You see I started Methadone Treatment,and I have taken it everyday since 6/18/07. About two and a half months of no period, I'm just wondering if there's a connection between the two. I am not pregnant, already checked, and I have never ever used any kind Birth Control(Pills,Patches,Shots,Nothing)!!! I know I should, but I don't even use Condoms or Diaframs!!! Anyway, if you have any helpful Info. I would really appreciate it!

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