I had my period on 6th sep. it went away sep 10th. i started bleeding again sep 20th. it's 9th oct and my period still not here?do i wait till oct20th

Common problem: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections & hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.