Hi I had a miscarriage in august, since then I have been having scanty periods, sometimes they are just blackish every two weeks, sometimes brownish, but last I had bright red blood and severe cramping for only 1.5 days, now am having lower abdominal pain and tenderness, my period is not due for another two weeks. I have no breast tenderness or nausea or any of the symptoms accompanied by pregnancy, what could be wrong with me?