Today is Sunday August 6, 2006. My period was Due July 28th. Over the past week I have been spotting, back pain, cramping. A week ago (Sunday, July 30), I got a light period that lasted less than one day and then spotting the rest of the week. I took two $tree tests on Thursday and Friday and both were BFN with very dark distinct lines (no faint lines). Today I do not feel any of those symptoms. I took a blood test but may not get results until Tuesday. Do I have anything to be worried about? Please help.