it could be any number of things. Are things more stressful than normal? Have you been ill? Gained or lost weight relatively quickly?
It sounds as though your cycle has been annovulatory (meaning no ovulation). If you go to your physican you can request a blood beta test be taken (that can also determine if you've ovulated any time in the recent past). At this point you should be able to request a round of provera (progesterone) to go ahead and begin a new cycle
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