Is it ok to have a beer while breastfeeding??

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SoO.. i hear it is ok to have a beer or two while breastfeeding, i even hear it is suppose to help with your milk supply. Well i had my first drink tonight and my son is 3 months old. I know it is suppose to be ok but i feel so guilty. I dont want my son to feel any affects from my drink. Is it normal for me to feel like this?