Now, when you say dream, do you mean actually sleeping dreaming, or fantasizing before you go to sleep dreaming? If you're asleep and you dream about your ex, our brains are working out issues while we are sleeping. Your ex's face is a familiar face, so that is probably why you specifically dream of him. This does not mean you want him back. Its also pregnancy dreams. They are pretty bad. If you are worried you'll talk in your sleep, talk to your fiance about it.
As to not feeling turned on by him...its definitely the pregnancy, unless you were never really turned on by him before (which, since you're pregnant, I'd venture to say its the former rather than latter). Some women want sex ALL the time, some women there's no change, and others just do NOT want to be touched/messed with AT ALL while they are pregnant.
All in all, you need to have a sit down with your fiance and chat with him about everything.
at 10:16 PM on Mar. 28, 2011