confused

Kennedy

okay so almost 3 months ago I had my daughter. I got the depo shot July 25 and had unprotected sex August 27. last week I took 3 pregnancy test and all came back with a faint line. so I took a blood test on September 5 and the hcg levels was not high enough to be a positive. missed my period this past weekend and this morning there was a LITTLE bit of brownish red when I was done using the bathroom and now nothing. what's going on with me..