Just wanted to post to say well done for telling that Doc what for!! im sure i would have just run and cried!! so good for you!
I dont really know your story, but like everyone has said before, this baby has his/her own story and not the same story as your little boy!
Trust you body....most of all, trust your baby he/she know what to do! and when to come!
Your mantras are great, i kept saying 'good pain' 'relax'....i had heaps more but at the time thats all i could remember and it got me through hours!
You can do it!!