Should I take plan b?

I've been on birth control for just under a month and me and my boyfriend had sexual intercourse last night, he pulled and prayed and he said he may not have pulled out in time. should I go buy plan b, please answer this is urgent!!

[Lanny_Licorice]

I would to be on the safe side If you don't want to get pregnant. When I was on BC, my doctor told me that It won't be In full effect until 3 months of takin' It.