Cummed in me

So I just had sex n some guy came in me lmaooo he said he wasn’t going to but he did... I don’t want a baby I have a iud copper paraguard n he said he would buy me a plan b tmro. Should I take the plan b.? Does it mess with my iud. Or should I just wait to see if my period comes.?

Do I take the plan b or no.? I know he’s gonna wanna bring it to me but should I take it or just keep it for someone else