Can you drink beer thats been open and sitting out for two days?

We were at my dads house having a couple beers and I set my beer down and pick it up about 15 min later uming I had left it on the counter cooking when i realized that it was an open beer that had been sitting there for almost two days, according to my father. It tasted like semi-warm beer, normal because i thought it had been there for 15 min, but because we live in mn and even inside its pretty chilly the beer wasnt all that warm. Can I get sick?