Super unsure

Kennedy
I'm 19 years old, been on birth control for about 3 years. Had to take a break on it twice for antibiotics. I usually never miss a dose and if I do I take it right when I remember. 
Today my partner ejaculated inside of me without letting me know with warning. He then told
Me and I peed right after &  then me being stupid I waited a little bit andended up giving him a blowjob and then we had sex again but he pulled out. 
When I left I went to the pharmacy and bought and took plan b one step Emergency contraception. 
Does anyone think i am most likely not pregnant?
Also i'm due for my period in 6 days now.