Do I take Plan B?

I had a hookup with a guy I’ve known for a few months. He did not ask about finishing inside me but he did....yeah I was pissed and I no longer talk to him. I think that’s so disrespectful. Anyway, I have a hormonal IUD (had it for a little over a year) and I get tested (during my yearly) in a month. My question is if I should still take Plan B. I have never taken it before and I’m kinda low on money this paycheck. So what should I do? Oh and I know I should have made him wear a condom so please don’t comment with that. Trust me, I regret not making him.