Question; 5 days after period

Hi, I have a question and it might be dumb, (pretty sure the answer is no, and most will say just to test, but I’ll ask anyways)

So, I’m 20 and was a virgin until a couple weeks, maybe even a month ago. I’ve had sex three different times, all with condoms on. This is a snapshot of my month, the hearts being the sex days obviously, and then when I got my period. Today is five days after my period and when I wiped after peeing, it was kind of a dark brown bloodish color, and also stained my underwear.

Is this just old blood filtering out? Or is it implantation bleeding? It’s not possible to be pregnant after having a period so that’s why I was curious because obviously there’s still a sliver of “oh gosh am I pregnant?” Going through my mind.

Just wondering what your thoughts are. Thanks in advance