Don't know what to do... Advice please

Hi. I'm 6 and a half weeks pregnant and am scared to have sex. 
Before I knew we were expecting we had a very healthy sex life but not now. 
I can't think of anything worse. 
I'm not sure if I'm scared or gone of sex. I just don't know what to do. I feel bad that my husband and I haven't had sex but I just can't bring myself to do it. 
Is there any advice any of you can give me that would be great :)