I feel for you hon...hang in there...it will get better.
I agree...take the time to talk about it when neither of you is particularly "in the mood" so there are no rejection issues...maybe over dinner or something (if you're feeling ok enough to eat!) When I finally had "the talk" with my hubby during our first pregnancy...I was shocked to hear his side. I, truthfully, wasn't much in the mood to be "romantic" for the whole 9 months...but I missed the intimacy.
He, on the other hand, did admit, that getting intimate with a pregnant lady just kinda freaked him out and he just wasn't attracted to me in the same way...especially when when I finally was over being sick, and starting to look pregnant (and I never felt better!) To him, I was still beautiful, but in a different way. He was honest, kind about it, and open, and so we figured out other fun things to keep the spark alive! (and it must have worked because we're expecting #2! but back to the same boat now! LOL)
Now...my friend has a crazy high libido and her hubby wanted NOTHING to do with her from the moment she got pregnant to the day she delivered...same issues...so she found some nice lingere that accentuated her awesome preggo bustline and was sort of A-line so that it somewhat hid her belly...that worked out great. But they did have to have a chat and she read him info from the doc about how it wasn't going to hurt the baby.
You'll both find your way thru this new phase of life and wonderful rollercoaster adventure...just like anything else that's new...you'll both trip and fall a few times on your way to figuring it out (just in time for everything to change again! Have fun with it!)
Good luck!