Quoting Little Bit's Momma:" Okay I'm sure it's been debated on a million times. However I was reading something last night about ... [snip!] ... I know that they don't know how much alcohol can be harmful to a fetus and what not. So just curious as to your thoughts on it?"
Because of how early in the pregnancy you are I would say you made the best decision. Though it's unlikely that one glass of wine is going to do major damage it is better to be safe rather than sorry. I don't think there is anything wrong with having a few sips or small glass of wine/beer near the end once baby is fully developed even though I personally probably wouldn't.