Help?

So I had sex with this guy and we used a condom and I was on my period it was light he was worried about cum coming out of the top of the condom and has been freaking out ever since he begged me to take a plan b he paid for it so I didn't care today probably a week or 2 after I have like brown and red discharge is it just old blood from my period or something from the plan b I'm completely calm and know I'm not gonna be pregnant but he's freaking out like I'm going to be pregnant what do you think