17 weeks pregnant and hardly ever want sex

So the title pretty much says it all. I am 17 weeks pregnant and i am never in the mood to have sex. I feel like its starting to effect my marriage. I have heard that so many women tend to feel more horny when they are pregnant, and while i realize every pregnancy is different, i just hate feeling like im failing my husband. I do have sex with him, but even he said it has felt so disconnected lately while doing so which is causing us to argue more outside the bedroom. I guess I am saying all this because I hope someone else has been through this and have some tips on how to overcome it. Is there anything i can do to increase my sex drive?..