Weird brown discharge?

Hey I need some advice. My periods are irregular, my last one ended January 24, and then I had sex the 25. we used a condom, and he didn’t cum either, but I’m paranoid. Thurs and fri I had light brown discharge, and today it looks like this. I don’t THINK it’s pregnancy bexause I haven’t had any other symptoms, and I think it’d be too early for implantation bleeding… and when I was pregnant a year and a half ago my implantation looked NOTHING like this.. but does anyone know what this is? It was really rough and my cervix was in a lot of pain for a couple days afterward, so is it just old blood from that?? I need advice, I just really hope it’s NOT pregnancy. Does anyone know what this is? Should I get tested for std? What do I do?