I think it's your choice if you want him in the room for the ultrasound. Can you possibly get photos and video of it for him though?
As for the birth, well it's a tough enough time without having someone in the room that will cause you more stress, discomfort. It's unfortunate for him but you need to look after you at a time like that.
As for the baby once his born, he doesn't expect to take him does he? Are you going to breast feed? I would think he could come and visit the baby at your house via arrangement. At least for the first six months or so.
I'm sorry your going through all this. It really is tough.
M: 29, H: 31 D: 9 S: 8 T: 13 Y M: 9 Y ILYBIDKIILWY 12/09/2012 ~~~~ Worrying does not empty tomorrow of its troubles. ~~~ it Emptys today of its strengths