How is your sex drive in first trimester?

This is my second pregnancy, I'm 5 weeks in, and I have absolutely no sex drive. If I happen to have one at all it's at like 2pm, the hubby is gone, and the desire only lasts about 10 min, then my mind wonders on to the next thing. At night when we go to bed he usually wants to get pretty frisky, but I literally want nothing to do with it. I have no desire at all. It's not that I am repulsed, I'm just exhausted. Nothing about it is appealing. I feel bad because I don't want him to feel like it's him, because it's not. My body is just preoccupied with something a bit bigger and energy consuming.