Midfulness on Monday! A fear that does not serve birthing women: "I am going to poop when pushing my baby out" An affirmation to combat this fear: "Each process that brings my baby closer is a gift" or "I am fully supported and comfortable"
It also would be helpful to decide in advance how you are going to handle the "pushing phase" I suggest checking out the information here, here, and here before you find yourself being coached to forcefully push out your baby.
A great place to learn more about how to make affirmations (and relaxation, visualization, and breathing) work for you birth is a HypnoBirthing class. I would love to have you to join an upcomong group.