Should I get Plan B?

So I had sex with my boyfriend yesterday morning and we didn't use a condom. I'm on the combined birth control but I don't take it like at the same time every day. I do take it every day though. He pulled out, wiped off a little bit, and went back in. Do you think it would be safer for me to take plan b or do you think that I don't need it? Cause I really don't know know which the right decision is right now.