Unknowingly Drinking Alcohol

Me and my brother visited this pizzeria recently and he ordered two apple juices. Ryder's Wild Apple to be exact. I drank a sip of it and it tasted and smelled a bit like alcohol and obviously had the apple taste. But it had that beer smell. And then only I saw the label 8.8%. And I stopped drinking after it. Did I break my 5th precept? I'm a person who doesn't take my precept very lightly. But I want to know whether I broke my 5th precept or not.