Is your SO understanding?

My husband just doesn't seem to understand how physically demanding it is to be 35 weeks pregnant. He is a very good man and works hard to give us a good life. He is sensitive to the things that make me sick (like certain smells) and happy to get ready for baby, but he just doesn't seem to understand why I am so tired or sore. He won't give me back rubs, he doesn't understand why I can't just stand and on a chair to get things off the top shelf. He also makes comments about how much better he would be at being pregnant, and how it's not his fault that I'm the one who has to carry the baby. He's great about the baby coming, but he's not great about me being pregnant. Does anyone else's SO just not understand what we are going through??