Birth control/ unprotected sex!!

I had unprotected sex with my bf last night, he didn’t finish in me, nor did he finish for a good five minutes after pulling out. I took my birth control normally before hand but forgot to take it that night, so I took it immediately when I woke up this morning. Am I okay or should I take plan b? I am trying to avoid plan b due to all the side effects but I know I’d be better off dealing with a whacky cycle than having a baby!!