text: why did i start my menstrual cycle twice this month? i started my cycle twice this month the first time i bleed normal and second time i started for one day only don't worry about it, if you get stressed or very upset it can sometimes mess with your menstrual cycle. if your taking the pill or any other contraception which aims at controlling your hormones, this too can affect your cycle. if you really are worried i would just go to the doctor to be on the safe side and to put your mind at ease.