Get your thyroid function test and vit d3 value.and pelvic scan.it may due to pcod or thyroid dysfunction. try to reduce your weight.

Hello.... ...polycystic  ovarian  syndrome  is the most common  cause  for irregular  periods in these  days..  Periods  occurs  with the interval  of two to three  month  gap in between..Other factors  affecting cycle are sickness, physical and mental  stress, young age, malnutrition, etc...  You better  consult gynaecologist  once.