I have regular menstruation last january.but in the month of february I have twice menstruation cycle. March and this month of april still no menstruation.. I know im not pregnant because im far away from my husband and I have my last sexual contact with him last year of december 9,2014.. so why my menstruation not coming for the month of march and this month of april.. im impatiently waiting to come.. I feel body pain and weaknesses. Can you help me about my situation.