I HIGHLY recommend the book "Natural Childbirth the Bradley Way". It is great in describing what happens and what to expect. I recommend it even if you are planning on an epidural; I did not have medication and felt VERY prepared. (I also took a Bradley Class, but feel this book was SUPER helpful).
Hormones do crazy things to us and I would bet that is why you are having these thoughts. I had a fear of death and injury to me or the baby after I had my first. I am not sure if I did during the pregnancy, but do know it was weird how intense some of the feelings were.
Just a side note, I also taught special ed before my babies were born---loved it. Congrats on the upcoming addition. Pray for a safe pregnancy, labor, and delivery. Phillipians 4:4 comes to mind..." Rejoice in the Lord always, I will say it again: Rejoice! Let your gentleness be evident to all. The Lord is near. Do not be anxious about anything, but in everything, by prayer and petition, with thanksgiving, present you requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.
Phil 4:4-7
He will be here before you know it.