Haha. I love these posts cos they remind me of myself. LITERALLY, every time I've had alcohol, I've found out I'm expecting 1-3 days after. With my first, I had my usual cocktail and it was AWFUL! The next day, I got a BFP. The second time, my OH and decided that we'd get drunk for OH's birthday, and we drank up a storm! I drank half a bottle of tequila, tons of whiskey, and some vodka, and I just couldn't feel anything! The next day, with no hangover, thinking that was REALLY weird, I tested - BFP! This time, we went to my cousin's party, and I had a shot of Jack, and my OH joked that I'd find out I'm pregnant. A few days later, BFP!
Also, this time, I found out late. I was eating RARE steak, RAW eggs, drinking 5 cups of coffee a day, etc. But, now I'm 21 weeks along with a perfect baby.
I doubt you've done any damage. My doctor thought I was silly for bothering with asking about all the dumb things I was doing when I found out I'm expecting this one and went on to tell me about how she went on a trip to an amusement park and rode all the rides, got drunk, had sushi, ate mystery meat from a truck on the side of the road, etc. before finding out she was 3 months pregnant with her first.
Her philosophy is that you've gotta give yourself a clean slate once you find out you're expecting and not do those things any MORE.