I had unprotected sex, help!!

Me and my boyfriend were fooling around on his birthday and we had sex 3 times that night. The first two times we used a condom for the whole time and the third time he stuck it in without any form of contraception for about 3 minutes before he put on the condom to finish inside. My period just stopped like 3 days ago and I don't know if is worthy taking the plan b pill