I had a missed m/c just over 4 weeks ago. I had a scan a week later which showed no retained products. The bleeding quickly stopped and I felt fine. I did my own HPT test (Boots brand using morning wee) two weeks ago to see if the HCG had gone, but it was still slightly positive. Last Friday I developed terrible abdominal pains and brown discharge. I went to A&E where they did a pregnancy test which was negative (evening wee). They decided it was an infection and gave me antibiotics. However all week I have had an achy abdomen and last night I had some slight bright red bleeding, which I thought was AF. However it stopped almost as soon as it had started. So this morning I tested again with a Boots HPT. It's faintly positive (although less than the test I did 2 weeks ago). Is this still residual hcg which was not picked up by the hospital test? Are NHS tests less sensitive than Boots tests? How long can hcg last after a m/c? Is there any chance this is a new pregnancy? I feel like I am losing my mind