Using a Plan B.

Hey, I’m 18 years old and I have a major concern. I had sex with my boyfriend on New Years eve and he said when he took the condom off, that’s when he seen that it was broke. He bought me a Plan B like 30 minutes after we had sex and I took it. Idk if I if was ovulating or not that night and I’m not sure when I had my last period but it was sometime a week or so before Christmas. I just wanna know if the Plan B took action or not. I am scared any suggestions?