Im freaking out!!

I'm 18 and I was really drunk last night and so was my boyfriend... Needless to say we had sex and lots of it. I'm not on birth control, he didnt use a condom, and I really don't think he pulled out... Im so scared though. Knowing my luck I'll be pregnant from this stupidity. I can't have kids. I'd be a shitty mother no matter how old I was. Kids aren't something I ever saw for myself because I don't want to be like my mother. This is so fucking scary. Someone please tell me I am over reacting....please.