Could my drink have been drugged?

I was partying last night with some people I don't know so well. I hadn't even finished off a can of beer, and I already felt really drunk. I ended up getting woozy and throwing up, and there was a small stretch of time (only about five minutes) that I couldn't remember after I threw up. The can of beer was open when the guy gave it to me, and it tasted a little odd. My friend says he's a bit of a sleazebag and she thinks he drugged my drink, but I don't think so as I imagine it would have affected me a lot more. Can anyone help me clear this up? Thanks!