I didn't got my periods since three months. Last was in 8th Oct. No PCOd ,No thyroid, No any other issue.everytime I go to gynae they give progesterone to bleed out. Height 5'7" weight 78 Vitamin D was in sufficient range . My usual period gap between 2cycle  is of 2 and half month. I am activee person .. goes to gym atleast 5 day a week Still not able to regularise my menstruation cycle. Any suggestion ,most welcome. P.s. in childhood I had MDR TB of chest