how to get my fiancé to help clean?

We moved in together a few months back, into a fixer upper house we got together. It got into the habit where on the weekends I do the cleaning and he would work on the house. I didn’t mind cleaning even though it’s a big house. It needed to get done, and honestly we have two very different definitions of clean. During the weekdays I always found that 30-40 minutes of straightening up was needed to get the dishes washed, floors swept, clean the litter box, wipe the counters and straighten up the house a little.

But my fiancé is a mess! I have the laundry hamper in the bathroom - I’ll come in to see a pile of clothes next to the hamper, or scattered in the bedroom. I try to wash my dishes after I use them - if I run out of time to wash my breakfast dishes before work, no big deal, I’ll wash them when I get home. But my fiancé has completely given up on washing his dishes on the weekday. I washed his breakfast dishes a few times to be nice, but now he DOESNT WASH DISHES. I’ve tested it - he’ll leave them in the sink until he runs out of dishes, then he’ll complain about it, wash one, use it, and put it back in the sink.

Then he brought home a puppy and wow that is an undertaking. then we found out I was pregnant, and then morning sickness set in and had only been getting worse. I don’t have the energy to do everything plus the puppy on my own, not to mention he already has a full grown large dog and I have my own pets.

I asked him to wash some pans he used the other night bc I’d been cleaning and throwing up all day and was exhausted. He said that he could throw them away and buy new ones. So yeah I ended up washing the dishes. Then yesterday. After I got home I took the dogs out and started straightening up the downstairs, feeding the animals, and cooking dinner and asked him when he got home if he could clean up the bedroom where the puppy was because she chewed up the puppy pads and the floor was sticky. I don’t remember what his excuse was or if he just ignored it but it never happened. Instead he went to the store to get dog bones and then stayed up late playing video games.

Then this morning he had the nerve to text me that the house was a mess and he “never has time for anything anymore”.

I tried explaining to him last night that I don’t want him to think I’m lazy or slacking around the house but I’ve been feeling so sick and I can’t keep up with it all alone, but instead of offering to help out more he just said “it’s okay you’re doing great”. Which is nice, but I still have standards for the house and I really need him to help out more.

I know it can kind of be a sensitive issue to bring up, but any advice?