Faint positive that faded


I had a miscarriage last month at about 6 weeks. And we tried again immediately. I had some very light spotting for a week before my period was due and I hoped and assumed that it was implantation bleeding. I started having faint positives on the little strips 3 days before my period was due. Then the day my period was due the line started getting fainter and is now gone. My period was due yesterday. I'm still having the spotting but no period yet. And I'm confused by the faint positive and the spotting in general. I was very excited and now I'm frustrated. I'm going to go pick up a first response today after work but I suspect I'm not pregnant. I'm just not sure what IS going on. Any thoughts