pregnant?

ok had a one night stand... he was too drunk to finish just found out hes MARRIED (we met at a bar) his wife somehow got my number and threatening me which i understand if i knew he was married i wouldnt have done anything but he had no ring and said he was single... i feel bad and now im worried i could be pregnant. is it possible? what are the chances? we lasted 1 hr and i got tired and just gave up and rolled over.