Brown discharge

So I had sex sept 22 and my period started Oct 5 and for 2 days now I've had brown discharge and im starting to get worried, yes I had protected sex, he didnt even cum because we didnt finish and we checked the condom after and it never broke, so idk if it's just old blood or what but it's been a week and some days since my period ended and l put my finger in there and saw some slight residue of the brown discharge and it seems like dry blood but then again idk