I had my menses two weeks ago and its back again. why?

Seek consultation : If not pregnant, irregular periods usually due to ovulatory dysfunction, which may be due to a variety of conditions - pcos, hypothalamic amenorrhea, thyroid disorder, hyperprolacitnemia, perimenopause or poor ovarian reserve, hyperandrogenism, etc. An evaluation therefore is the most important first step as the management of irregular menses and conceiving depends on the etiology.