I’m so lost

I’m 5 weeks and 1 day post natural miscarriage and my hcg on July 23rd was 6,151. I took a test and got a faint but pink line. Is it possible it could be left over hcg? I haven’t got my period but I feel pregnant all over again. I’m starting to think I have left over tissue in my uterus which is causing these faint lines because they aren’t getting darker nor lighter to me. I also took a test at night on 8/27 which looks like the test from yesterday.

Top is from yesterday at noon and the bottom is from smu

Top is from yesterday at noon and bottom is today smu about 15 minute hold.