Pregnant? Plan B?

My period is 30 days late. I’m not on birth control or anything. I just had sex a few minutes ago, he didn’t wear a condom. He didn’t finish inside me. I’m so scared that I got Plan B. Should I take it? I don’t know if I’m ovulating because my period is so late. I weigh 189/190, not sure if it’ll be effective for me… I can’t get Ella in time.

(I understand I should be using protection, I do. This was the first time we didn’t and now I’m paranoid so I’ll never do this again. I just need help.)