Cat litter

During my entire pregnancy, my husband has been seriously slacking on taking over cat litter duties.  It's the ONLY thing I've asked him to do.  I've nagged, I've yelled, I've cried.  Nothin seems to work with him.  He knows the risks, he knows my concerns, he just refuses to do it.  For about 3 months I did it myself because I was so annoyed and frustrated, but stopped again because I decided it was just ridiculous that he wasn't doing it.  Is anyone else going through this or something similar?