Hello dear Understand your concern I think it is due to hormonal imbalance or pregnancy Other cause may be Endometriosis Fibroid Adnomyosis Cervical dyspasia Peri menopausal state. High level of stress Thyroid problem Hormonal imbalane: Do regular walking and exercise. Eat healthy diet Consult the gynecologist and do following tests: USG Hormonal assay Endometrial biopsy PAP smear Ovarian follicle study Also note that Menstruation required co ordinate action of various hormone that secreted by ovary (estrogen and progesterone) and brain (FSH and LH). If any above hormone is decreased or increased there is imbalance in menstruation. So please do full hormonal profile : Estrogen, progestron, LH, FSH, HCG and thyroid hormone. That help to diagnose hormonal imbalance. After confirmation you can take treatment according So please go ahead. Hope this may help you All the best. Stay healthy.