Hm, I am not sure about med changes - but is there the chance that if your med was upped, the contributing stress and emotions that led to the change in med has affected your menstrual cycle.
Either way - the menstral cycle is known for being one of the finickiest things in women-kind so it may be that the change in your system upon the change of meds affected it.
It should settle down again soon *hugs*
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