It's normal to think about things like this as we know that our children can inherit certain tendencies & even certain mental illnesses such as Bipolar.

My feeling is that it's quite responsible to think about things like this. Things like environment are dependent on the things that happen around the child....but being aware of that & trying to be the best parent to avoid & to help the child get through rough or trauma issues that may come in their life points to the fact that you are good & caring parents.

I would say Not to obcess over these things, but in moderation & for the good outcome of the child...it's good parenting.

Don't judge yourself in a hard way about things like this....it will all work out well & congratulations of your first child.