How do I go about this cat litter issue?

We have two cats I’m currently 16 weeks pregnant and have a three-year-old toddler. I’m a stay at home mom so I utilize my time as much as I possibly can cleaning the home maintaining it doing laundry basic chores while my fiancé works his 9 to 5 job. The problem is my fiancé isn’t the best at maintaining cleanliness let alone doing the cat litter properly. I was advised to stay away from doing the cat litter normally this is my responsibility but after finding out I was pregnant we made an agreement for him to do the cat litter he normally does trash by the way I do the other house chores. My biggest issue with him doing the cat litter is that he doesn’t scrape all the P out of the litter it ends up sitting in the bottom of the litter and the smell of ammonia starts to spread in the air and it gets stronger and stronger. He also doesn’t do the litter often so I often have to kind of remind him and now that my senses are even stronger it seems to be annoying him that I’m reminding him to do the litter. When I do the litter I make sure the litter is fully cleaned out I try not to let it get past a few days of doing the litter of course. I also remove the litter box from where it’s placed sweep the floors mop and wipe down the area then put the litter box back where it was. I understand maybe I do an overkill of thorough cleaning but this is to illuminate odor and just maintain the litter area. The litter is located in our bathroom this is an area where I bathe her toddler and of course we use the bathroom so it’s a room that we have to use every day. The smell of ammonia it’s foul let alone it burn in your eyes when you walk in the bathroom or stinking the hallways just makes the environment uncomfortable to live in. I didn’t grow up with that older but my fiancé did. Unfortunately he grew up with his grandparents hoarded cats. The smell of ammonia reeked their house from a mile away, so he doesn’t even smell anything wrong. He’s not a tidy clean person that’s where I kick in but I’ve been feeling overwhelmed lately trying to get him to do the job “right”. Although I do not work and I stay home again I do what I Gotta do today I went ahead and just did the damn litter it was awful and I don’t want to put my health on the line just because my fiancé can’t do things properly if that makes sense. I don’t wanna come off uptight but I don’t know how else to approach the situation to him to get him to comprehend and understand and actively do things properly without him acting like a teenage boy and getting annoyed at what I’m saying. Any advice?