Fiance wont get rid of cat even though its a hazard to our child's health!?

my fiance and i have had this cat for less than 6 months and he will not get rid of it even though our house smells like ammonia from the cat peeing on our carpet! im due any day now to have our child and the cat will not stop urinating everywhere and the smell is so bad it gives me a headache! he works nights and sleeps all day so he isnt here long enough to catch the cat urinating on everything. lately the cat has been clawing at our daughters door trying to get in and one day i didnt shut the door all the way and the cat ran in and tried to pee by her crib and when i yelled at the cat it ran under the crib and tried urinating there! im 9 months pregnant and its hard for me to get up quickly and the cat will pee in the floor and when i go to get up to stop it, it will run right past me and hide under the couch. i dont know if its doing this out of spite bc hes angry my fiance works all the time or whats going on with the cat. i know that the smell and ammonia is horrible for the baby and so does he but he still will not get rid of it! any suggestions?