feeling unwanted & unpretty....

my husband and I haven't had sex in awhile, i think it's almost been a month, not even sure. I am 33 weeks and 4 days pregnant and I keep having dreams he is cheating on me and then in my dream he leaves me. When I had my daughter 7 years ago "sperm donor' cheated on me and left me. I don't think my husband would do that. But I just hate that we aren't having sex. I have mentioned it to him and he says we will have sex, but then we don't. I feel like he thinks I look gross, fat, unpretty, etc. Even though he told me I am not any of those things. It makes me think he isn't attracted to me anymore. Idk what to do. Just really sucks and makes me really upset. :(