Just part of life...being scared.Once you become a father you start to pull away from all the partying and start doing more family things.
You'll be fine,just read up on some things and go to the doctor with your wife as much as you can.Those trips will really help because you can ask the doctor anything and they will be willing to help as much as they can.Plus like another member here,you won't get screwed on doing all the housework.You'll know what's safe for your wife to do during pregnancy.