Overracting?

So my husband flew off the handle tonight because he has been doing so much these past few weeks around the house and I haven't. I'm 10 weeks pregnant and have zero energy or have been super nauseous. Plus I work anywhere from 45-55 hrs a week, taking care of someone else's child, and when I come home I'm spent. We also have a 4 month old puppy, that when I come home I take care of, he hardly does anything for her because "he's not the one that wanted the dog". He's mad because tonight was the 4th time he has had to unload the dishwasher... he also had to do a more disgusting job as we found a half eaten rodent in our yard and I couldn't be the one to dispose of it. I get why he is frustrated, since he has had to take on more stuff that I can't do. But keep in mind that just two months ago I was the one doing practically everything in the house. Plus he leaves for work after I do and arrives home anywhere from an hour to two hours before me.

I guess my question is, is he overreacting? Or am I the one at fault?