I am 20 yrs old and have been on birth control since I was 17, this summer I stopped taking it for a bit but have now been back on it for a month. I drunkenly made a mistake one night and had unprotected sex with a guy I barely even know. Once I realized what I was doing I stopped half way and left. I'm almost positive he never finished because when I pulled away he wanted to keep going so I'm assuming there was nothing there for me to worry about. After sti worrying I finally decided to take plan b 24 hrs later.. do you think I should be worried or will I be free of pregnancy?!