Hello, Have you gained a lot of body weight? If yes then irregular periods and weight gain is a common cause of PCOS. Visit a gynecologist and get yourself evaluated to rule out the cause. You can also visit my clinic International Fertility Centre located in New Delhi for further evaluation. My clinic offers varied gynecology treatments and services to help you have a successful treatment. You can mail me your contact details so that I can get in touch with you.

If you are having irregular periods only in this  cycle then wait for another two weeks. You should consult a Gynaecologist personally to get your ultrasound done also.

It may be because of any medicine u have taken or any exertion physically or mentally  or a hormonal problem   .