No libido, feel like a shit wife...

Ju

I'm in my late second trimester, and my husband is my best friend. I love him so much and I think he is so sexy and wonderful and amazing!! But all through my pregnancy I have had a major dip in desire to have sex, or honestly even be touched. He is a major physical touch person, and I have been trying. But I just don't want to have sex ever. I dread the thought of it. He has been understanding but I know that it hurts his feelings that I don't want to have sex with him and it is making him feel unloved and undesirable even though I try to affirm him with words. Basically I have this horrible gut wrenching guilt that regularly sends me into tears because I feel like I am not being a good wife. Have any of you guys had the libido problem? Any tips to help it?