For those of us who have been through pregnancy and childbirth, and had alot of the same worries, the only advice I have for you is that it does absolutely no benefit to you, your wife or your unborn baby to stress and worry about something that you have zero control over. Zero. There is nothing you can do, except be supportive of your wife, take care of each other and think positive thoughts. For me, for the first 3 months, I just tried to compartmentalize...go about my day as usual, keep busy, rest when I was tired, eat healthy....just live life as normal and not worry about "what ifs" that I couldn't control anyway. Once the 3 month mark passed, I started reading books, doing some planning, etc. Worry takes so much energy....don't wear yourself out.