I just wanted to add that I'm not saying he shouldn't be there to see his child after he's born on the day and after as I do believe that a child has a right to a meaningful relationship with both parents when/where possible, or else it's the child that ends up missing out (yes, even with a lying, cheating A/Hole like him though I suspect by the behaviour he's been displaying thus far, he's only going to want to see his son when it's convenient for him!!).
I just meant that if you don't want him at the actual birth, perhaps he can see him, for eg, a few hours after he's born or when you feel up to it after you've recovered a little.
If that's the case, it's entirely up to you if you let him know when you go into labour or after the baby's been born, plus the nurses won't let him in to visit you if you tell them you want to know/approve all visitors in advance ok??