Discharge isn’t normal?

I had sex, unprotected, the day my period ended, which was 7-8 days ago. He did cum in me, I do know this. I hadn’t took my birth control in a while, because I am out. Yesterday I was slightly cramping, but I thought nothing of it since my period ended a week ago. Earlier today, I saw a dark brown spot, kind of like a period spotting look in the underwear except it wasn’t red, but completely dark brown, and no blood smell to it. When I wiped, there was no dark red blood, but only a tiny drop or 2 of very light pink “blood” on the toilet paper.

I have no idea what’s going on...I’ve been extremely pissed off for the past 2 days. What the hell is going on? (I’ve never had my discharge be THIS dark brown)