Husband doesn't understand

Pregnancy has been really hard on me emotionally and physically. Health wise, it's made things worse and more difficult. More than expected. Lately, he just gets upset with me. Has little patience, gets upset I can't do the things I use to do, and doesn't understand my emotions. It's really getting me down and into a depression. I've bought him books, but he won't read them. He reads plenty others, but not the pregnancy books. He shows little interest in anything baby related besides coming to appts. He just works and sleeps. Is anyone else struggling? I fear I'm losing my once healthy relationship, for a very planned baby.