General pregnancy ?

General pregnancy question. So 2 weeks ago I misscaried when I went in my hcg was 82 I had to follow up two days later and it was only 18 so it dropped significantly low in just two days I only bled for 4 days my husband and I BD last week.. out of curiosity I took a pregnancy test it was a really really faint line. I just can’t think I have anymore hcg left from miscarriage since hcg was 18 2 weeks ago and I haven’t bled since then.. ?