Bisquick I think pregnancy is a valid reason for getting a bit more 'involved' in things than usual. I think being nervous as well is round fair, it's the unknown, and this could have a huge impact on our children's future. Or it could not.
I know that's not really helpful, but it justifies your feelings! You're not irrational.
All you can do is try your best to distract yourself, find yourself a good series to binge watch, start making a baby wish list, go on a Pinterest rampage and plan their first birthday party! Focus on all the happy things 
Or if you're me ... an excessive deep clean of the house!