Does even a few sips of alcohol effect early pregnancy?

First off, IM NOT PREGNANT. Just curious. If you're in early pregnancy and you don't know you're pregnant yet, if you take three or four sips of a beer or other type of alcohol,  will it still cause damage? Again, I'm just curious. And does it impact anything if you take a few sips if you're 8 or more weeks pregnant? I honestly don't know what made me curious about this because I don't drink and I don't know anyone who is pregnant, I'm just wondering.