Sorry for your loss. When I had light bleeding at 5.5 weeks with my 2nd m/c I had a HCG reading of 3 which is classed as negative and two days later it was 0. This was after having 3 positive HPT's all different brands. At the hospital on the day I got the reading of 3 I was told either I was earlier than I thought I was or I had already lost the pregnancy, turned out the second thought was correct. My bleeding was less than a normal period.