I'm had one drink and I breastfed...please help!!!!

Okay so I had one drink and about two hours later I breast fed my baby. It wasn't a large drink and I didn't get drunk but I'm terrified bc after my newborn breast fed she's literally just knocked out. She's so asleep. Did she drink contaminated milk. Please help what do I do I'm a first time mom and I would never want to hurt my baby