I havent had my period for aobut four months now and im scared something bad is wrong with me. I know i cant be pregnant because i havent had sex. i usually have my period every month but i havent had it since july. i dont keep track of what day of the month my period comes but i know have it every month but like i said i havent had it in four months and i know for sure im not pregnant. is there something serious wrong with me?