Hi, my name is Betty. I am 23. I have a question about my period. THe last time I saw my period was august 6, a month and 13 days now. I am not pregnant because I havent had sex for the last three months, which was even before my last normal period. I have been having signs of period since my expected day of my period, but nothing there at all not even a spot. I have experienced headaches frequently and diziness sometimes after getting up a seat of getting of the bed, for the last one week. What could be my problem here?. I did not change my diet nor schedule nor exercise.