Thank you for your question. I can understand that you are concerned. In PCOD the ovary does not release an egg. The first part of the cycle is governed by estrogen which makes the lining of the womb thick. If an egg is not released this lining keeps getting thicker and crumbles unpredictably. This is the reason that you can have bleeding at very short intervals or after long intervals too. Often women will not bleed for months and then once they start bleeding don't stop when predicted. It all depends on the levels of estrogen and the response of the lining of the womb.Your gynaecologist can help by prescribing the combined pull which has a fixed dose of estrogen and progesterone. This will give you regular predictable bleeds and also protect your ovary and endometrium from adverse effects of the PCOD metabolic effects.