I don't know if thsi is anything serious or not but for the last 6 month or so I have been having a really weird period cycle. I have a period every second week that lasts for about 5 or 6 days but in between all periods I have light spotting. The blood that comes out between periods is old and brownish. I don;t think this is normal. Nobody should have a period every second week. I am always bleeding and don't know why. I have a lot of stomach pain and weakness aswell. I know I'm not pregnant as I am currently not sexually active. Can someone please tell me what is going on with me?