I agree about the Evidencing Better book being really helpful though it is a few years out of date now so there may be further evidence.
There are plenty of European countries where women drink moderately during pregnancy without a spike in problems with babies. Obviously that's not binge drinking or 10 pints a night..
I hate being given arbitrary (well meaning) advice that isn't backed up with good quality, rigorous evidence - including that sleeping on your left side is better than sleeping on your right side.
There's no safe level of drink but there's no safe level of bananas, walking, chocolate, wifi, being near traffic etc either and you don't see people avoiding doing all of that. Some doctors say you can't have an orgasm during pregnancies after IVF despite there being (as far as i can tell) no research on the matter what so ever.
We each create a random list from all the info out there about what we will do or not do when pregnant or being a parent which we all have to grin and bear. (my favourite being a very middle class woman smoking within about 3 ft of her child but saying that the child wasn't allowed a single watsit because of the salt content).
The one thing i want to do is eat a really bloody steak but that seems to be something that there really is clear evidence that it's dangerous so i haven't and i'm desperate for one. I've not been bothered about booze or coffee through pregnancy but if it comes back i will defo treat myself to a nice gin and tonic without feeling guilty.