As someone who's partner left the day after we found out the sex on a 3D scan, I think perhaps your emotions are all over the place atm. Not trying to belittle you AT ALL, just can tell you are upset and, although he doesn't sound supportive in the slightest, there must be a reason you are still with him.
My ex can't make up his mind what he wants still and we haven't seen each other since Feb. It's really tough when no one is around and you just want a hug, or realising he hasn't even seen the proper bump or felt her kick.
I'm up for letting him be part of her life, but he doesn't seem to be very stable in his decisions and is refusing to pay maintenance as he thinks it is me "punishing" him
. All in all, it's just worth thinking that even if he is very unsupportive, it's perhaps not as bad as it seems just now? Otherwise there is a lot of emotional crap and things to sort out with visitations/selling house etc and you need to really think how you will feel being alone. It is tough. But weigh up carefully what you do get from him - does he cook, clean, support you in another way? Sometimes it can be easy to overlook if you are tired and emotional.
Funny thing is I think i'm looking forward to the baby that much more now that he has left, as then I get to reap the rewards, not worrying about their lack of parenting skills for a start! :) So don't get me wrong, there are definitely up sides to going it alone!