My poor DH isn't doing half the things yours is, but he's probably getting snapped at just as much!
Honestly, I'm not generally one of those long-suffering wives who is willing to cut DH slack just because he happens to lack a second X chromosome. So in your place, I'd be angry with him over the laundry and toilet issues even without the discomfort and hormonal upheaval of late pregnancy. If my DH were to do those things now, I'd probably make "psycho" sound like a very mild state indeed!
He has already gotten an earful once or twice about the dishes (which makes him shape up for approximately 24 hours, then the counter is covered again), but I don't feel bad about that. What I feel bad about is yelling at him for little, incredibly stupid things that he really didn't know would inconvenience me. I nearly bit his head off yesterday for putting his underwear in the hamper INSTEAD of the laundry basket full of whites that was sitting on the bed, waiting for me to carry it down to the laundry room.
Five minutes later I realized that he probably thought the stuff in the basket was clean and waiting to be folded (the usual situation for a laundry basket on the bed in our house).
: Poor guy! He really is trying. Gotta think of a good father's-day/thanks-for-putting-up-with-me gift.
That was a really long way to say that you're not unreasonable to want him to clean up after himself, especially while you're so uncomfortable. And you're not the only one with a short fuse, so tell your DH he's just lucky he's not married to a real shrew like me.