Hi i'm 16 i have a question about my period i tried to type it all but it wouldn't let me dark brown and red blood medium flow unprctd sex 2wks ago ?

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.