I wonder if that's what they said in the 60's when huffing on a cigarette and sipping on a martini.

Like I said commonsense is at play. If you drink 2 litters of coke a day it's not going to be good for you pregnant or not but when you have a life growing inside it's probably best to ask yourself "am I being healthy". A glass of coke is not going to harm the baby, nor is a glass of wine. But if you are doing anything that is unhealthy in excess it's common sense that it's not good for either of you.

And stressing over every little thing probably isn't good either