plan b - worried

last night my boyfriend and I were really drunk and had unprotected sex for 5 min. max. he didn't finish. I'm not on the pill and usually we use condoms. I'm in my fertile window right now so I got super worried and went to the store to get plan b. I took it but I'm still really worried about pregnancy, and my period doesn't come for another 2 weeks. how likely do you think it is that I'll be pregnant? I'm so worried