No Sex since I've been pregnant !

My husband has not wanted to have sex with me since we found out I was pregnant, before sex was never an issue for us but now he barely touches me and it makes me feel unattractive already and I'm only 6 weeks. makes me worry about how things will be once I'm bigger or even after I Give birth. He's excited about the baby so I just don't understand. Has anyone else been through this? Is this normal for men ?