I'm with @Scottishskifun - I did a lot of (scientific) reading about actual risks during pregnancy, first time around.
The alcohol thing is a funny one. To be clear, I agree with NOT drinking while pregnant, on the whole.
However, the 'zero' rule is simply to avoid guidance being confusing. Clinically, there's no proven risk of light alcohol consumption, particularly during the second and third trimesters.
But there's no certified 'safe' amount, so to keep it simple, authorities say zero. It avoids different interpretations of 'light'.
So, definitely don't worry about the odd sip/taste of something here and there!
Fetal alcohol syndrome is only caused by HEAVY drinking - like alcoholic level.
Our mothers' and grandmothers' generations used to drink a fair bit while pregnant.
Pregnancies are at greater risk from work stress, or driving a car.