One or two glasses of wine is perfectly fine for pregnant women. I used to think any amount was terrible until I actually had a kid and learned that it's perfectly normal and in fact healthy in moderation.
I've also worked as a bartender. Depending on the state, you can refuse to serve a customer without giving a reason, like here in NC. You can not, however, give certain reasons for refusal, I.e. race, religion, pregnancy, etc.
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