Hello, First of all, you need to rule out pregnancy completely by one blood test for beta HCG. Other reasons for irregular delayed period are hormonal imbalance, ovarian cyst/ PCOD (most common), stress/ anxiety, thyroid problem, wt gain/ extreme loss, irregular eating habits, ovarian cyst etc. Here, you need to consult with gynecologist for relevant investigation like USG abdomen and other hormone assay, blood sugar & prolactin level etc. Proper treatments depend on causative factors. Hormonal medication is the key to regularize your period. Do these things- Avoid stress/ tension by regular deep breathing, take healthy diet with Vitamin & iron supplements, eat more vegetables & fruits, drink more water, keep bowel habit regular, control body wt and need proper sleeping. Be well & take care.