Is it possible to have a first period and still be getting light positives 4 weeks later after period ??

I was a little under 10 weeks when I miscarried.

I keep getting faint positives on pregnancy tests. They seemed like they were getting darker but very little. I got 2 negatives on FRER then two days later 2 faints but now I’m thinking maybe my pee was less diluted with the next tests. (We were pulling out also so chances of that failing? Idk)

BUT i also already had my first period! I’m so confused 😞

Could this be a brand new / chemical pregnancy ? Why would I have enough HCG to get faint lines on FRER and Walmart cheapies