HCG level question.

I had a miscarriage Feb. 5th of this year. I went back to the doctor the following Monday to check HCG and it had drastically went down, which confirmed the miscarriage. They wanted me to come back once a week to retest but I didn't because at the time I couldn't bare the thought of being at the OBGYN office and seeing pregnant women. About a month later I had my first post-miscarriage period. My question is, is there ANY chance of HCG from before still remaining in my body? I had a faint positive test this morning and of course my mind has been racing. Thank you so much for any answers and advice. ❤️