Help explain this

So I thought my period was over because it was just like dried brown blood and my s/o was okay with that during sex. Anyways so while having sex and foreplay and all that I mention how my vagina feels a little weird but I also figured it's because we haven't had sex for a week and we were going at it. But then he pulls his fingers out and once we check there was a little bit of blood on his fingers and the condom. It had just happened though because we were having sex for a little bit before that and it was fine. So I went to the bathroom it wasn't extreme it just looked like there was a little bit of my period left. But my anxiety is bad (overall) and I'm worried. What if it wasn't leftover period blood and it's something else? The condom didn't break (we filled it with water and it was fine) but things like this give me bad panic attacks. It is possible to just be a little bit of my period leftover even if all day it was just brown and like old blood? Technically my last day was supposed to be today too. Idk please help! I sound so dumb my mind just goes to insane places when I worry because of my mental health!!!