Hello, There are several reasons for irregular period like ovarian cyst or PCOD (most common in your case), hormonal imbalance, stress/anxiety, thyroid problem, wt gain/ extreme loss, irregular eating habits etc. Need to investigate properly to rule out underlying pathology by USG lower abdomen & complete hormone assay, thyroid profile, blood sugar & prolactin level, blood testosterone level etc. Consult with your gynecologist for proper guidance and take suggestive measures. Avoid stress/ tension, take healthy diet with Vitamin & iron supplements, control body wt and take sound sleep. You may need to take hormonal therapy to regularize period with other supportive medication. Be well.