I have not gotten my period this month .. iam not pregnant cause i'm not sexually active but i do take folic acid, iron, &flaxeed and fish oil vitamins?

Irregular menses: Many women have irregular menses at some point. The length of your cycle as well as the flow of your menses may change based on stress levels, hormone levels, dietary and weight changes. I would keep a calendar with the days of your bleeding recorded as well as the flow description (heavy, light, etc). If your cycle does not return after a few more weeks, i'd seek a medical eval.