Not sure if chemical pregnancy or not

Ok start this by saying I had a chemical in September and I remember the process pretty well— I took an early result test 5 days before AF, it was clearly positive, started spotting 4 days later, took another pregnancy test and it was negative that evening.

Fast forward to now, same scenario— had some very similar bleeding to last time, but when I took a test it’s very positive — control line is just as dark as other line. So, my question is, can hgc be in my system for a while even if I’ve had a chemical pregnancy or is this implantation bleeding?

THANKS for any input!!