Really confused and lost. Long but help please

Pleasw do not judge.. i just need someone to talk to. last night I went to the rodeo in town I always go to. We live in a small town so that's the "big excitement" if you wanna say for our town. I knew some of the people I had graduated with was drinking. I'm 20. I was leaving and I had to park about a half mile down the road in the pasture since there is no parking but there. As I was walking alone one of my classmates came up to talk to me. Of course he was drunk beyond anything. We have always had this really good friend thing going on. I've never flirted but he has with me. So he started talking to me and then he started feeling me up. Which at this point in my life why not just talk to him see where things go. Then he tried kissing me. He decided he wanted sex. I was almost ok with it so I tried it and after a few mins I felt horrible. I realized he didn't have a condom on and I don't know if he cum in me or not and I'm on my fertile week. I plan on asking him just worried he won't remember since he was drunk. I kept telling him you will regret this tomorrow you are drunk. And also becareful I'm not prepared to have a baby right now.. so as soon as it was over.. guilt set in really quick.. I feel horrible for letting it happen. I've never had sex with anyone I've not had feelings for. Then the more thoughts of what if he could have gotten me pregnant.. I just really needed someone to talk to since I don't have anyone in my life right now to talk to it about. If you are going to judge please dont..