My house smells like cat poop

I came downstairs this morning and my house smelled like cat poop. Since I'm pregnant, I can't clean out the litter box. I asked my husband to do it before he left so naturally, he forgot. :oP I could not take the smell any longer so I took the litter box outside and let the cat out too. (I'm not a bad owner... he likes to be outside so it's like a treat for him and he always comes back) Then I sprayed my house with Febreeze air freshener. I thought that would take care of it but I keep smelling it! My only thought is that he pooped somewhere else but in the 2 years that we've owned him, he has never pooped anywhere but the litter box. The smell is about to drive me crazy and I have no idea where it's coming from! Ew!