Am I Pregnant or have an infection?

I'm eighteen, I was out last week, I was on my second day of my period. I think I may have been drugged that night and went back to a lad's house and had unprotected (I just lost my virginity to him). Anyway, I haven't been feeling like myself and becoming paranoid if I'm pregnant or have an STD. He did say he didn't "" me... chances??