Could the irregularities in my period be caused by Accutane?

I have been taking Accutane for 5 months now (30 mg daily after meals for the first 2 and 40 for the remainder) for cystic acne During the past 2 months , I notice that I keep getting my period- though it is not my time of the month.I now experience bleeding almost every week-though it is not heavy at all.

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