Hi, I just ended my menstrual cycle on the 12th of this month. Today I started another period.. This hasn't happened before, well, in the past I've had two periods in one month, but I would start on the first and begin again at the very end and continue into the next month. Never only 12 days apart though, I'm not on any birth control, nor do I take anything to alter my cycles. Is this normal and what could this mean?