beyond frustrated! positive hpt almost 10 wks after mc

I had a early miscarriage in November I was 5 or 6 wks. They did a scan and said I passed everything naturally and there was no reason to continue testing my hcg levels. I had positive for a few weeks after but they faded away. I still haven't had my period and took a test and it came back very faint..... I'm am very frustrated. Do you think it's leftover hormones or a possible new pregnancy? I am going to test again in a few days and see if the line gets darker or lighter.