sperm can survive up to 5 days inside a woman.
it's unlikely but NOT impossible for you to be pregnant. it HAS happened. the likelyhood of you being pregnant though is very slim.
The likelyhood of you getting pregnant is very slim, but sperm can live 2-3days even after being exposed to air. The plasability is very rare... just take a test if you are late.
yeah there could be a chance, id take a preg test 3 weeks after this happened