Well since I'm only like... 3-6 DPO of my first cycle, I haven't had to worry about it yet. I had a glass of wine on Saturday. If I have a fertilized egg, today would be just about the earliest it's implanted, so even if I had binge drank a few days ago, there would be no way for it to pass along to the.. zygote? Blastocyst? I can't remember what it's called at which stage!
We have very little research in the U.S. on the effect that light drinking has on development, which I think has a lot to do with the negativity surrounding women who have even a sip of anything with alcohol in it - it would be hard to get funding for something that is so stigmatized, and it would be hard to get women to admit to having any alcohol. I've tried to do my own research, and I read up on a longitudinal study that followed mothers during pregnancy then checked in again at a few years old, and again when kids were a bit older. I think it was done in Australia, where they're a bit more relaxed about it. It showed no correlation between drinking a single drink or less per day and prenatal or childhood development.
I'm not saying I will be drinking throughout the pregnancy when the time comes, but I'm just wary in general of advice and guidelines that I can't find solid, scientific information on.