2 months ago I had a period that lasted 2 weeks and looked like brown disharge with thick blood strings , a month ago I had a one week period that was like brown discharge again , now I have been on my period for 2 weeks still with thick blackish blood but light bleeding , I went in and got a pregnancy test , a ghonneria test and clymydia test because they take tests when I go to get my birth control ,I am on the bc Shot , but I have not gotten an annual exam , I'm not sure as to of why I'm bleeding this way , help?