Pregnancy fears

Im currently 31 weeks and have a new fear. I've dealt with a lot of pregnancy related anxiety due to past miscarriages and this weekend I developed a new fear. I went out dancing with some friends well into 3 am and my munchkin didn't react to the music at all. One of the possible father's is partially deaf so now I'm concerned my son may be too. Has anyone else had this fear? And if the baby was deaf, how did you find resources to help you learn how to care for them?