A few thoughts from a couple that went through the same thing 20 years ago...
It is crucial that you tell him how you're feeling and keep him in the loop as to how you're feeling each day. He seems to be very understanding, but he's not a mind reader
I'm sure he's intellectually aware that it's not about him, but remind him anyway just in case he having a bad day. We men are more fragile than we seem.
Don't feel bad for how you're feeling. You're growing another human being inside of you. That's hard work!
Pregnant women are sexy!
Even though DH sounds like an amazing man, he still has sexual needs. Not necessarily a need for sex, but for a sexual release. BJs and HJs are very useful tools to get through tough times.
Don't forget this lack of desire is temporary. There is a light at the end of the tunnel.
Did I mention that pregnant women are sexy?
Hang in there!
Feel free to PM if you want to.