Most women with PCOS don’t ovulate (release an egg) regularly, with infrequent periods like cycles over 35-40 days or skipping whole months, or even no periods at all. Not ovulating can also cause frequent irregular bleeding as the lining of the uterus can become thick and bleed unpredictably. You should be checked for thick lining, fibroids or polyps inside your uterus; very thick lining needs an endometrial biopsy test to rule out precancerous changes.