No sex drive

Amy • Beautiful b/g twins were born 1/17/16.
Am I the only one who does not even want to think about sex? I'm 6 weeks pregnant and I haven't had sex in 3..almost 4 weeks because I have no sex drive! My boyfriend told me earlier he feels unwanted because I haven't had sex with him. I tried to explain that it's the hormones making me not want to have sex but I don't think he believes me. I love him and I want nothing more than to make him feel wanted. What should I do?? Is there any way I can up my sex drive??