Wow I wish I had known this was even a thing... I was petrified about child birth I physically didn't want to do it. I wanted to reverse time and not be pregnant.
I did obviously have my baby, and it didn't go to plan (makes everything worse!) but, I got through it.
I was in that much pain that I didn't even have time to fear the prospect of giving birth I just wanted the bloody pain to stop. I was focused.
All I can tell you is that you will be focused when the time comes and this won't be at the front of your mind.