Sexless marriage

I've never felt so depressed. We're married, but our sexlife is non existing. We used to do it all the time and now 2nd year in he claims too tired/frustrated/stressed with work. He wouldn't even let me touch him anymore. I'm surprised I'm even pregnant right now with the only few times we've done it. It just makes things worse that I'm pregnant. I feel fat and disgusting. Maybe that's why he doesn't want to even touch me. Sigh... anybody else going through this?