What Possibilities Do I Have ?

So I been with out birth control for approximately 3 weeks I have my app to get more birth control pills on June 4th anyways Last night I had sex with my boyfriend without protection we used the pull out method. But I'm a little concerned because Im not ready for a baby. Should I take the after pill? Or do you girls think I should be okay? It's the first time that I been without birth control in 4 years. Thank you =)