With a pregnant wife at home I would do this outside. If the rain water goes into the sewer than that is the place where the bleach water should go.
Different municipalities have laws governing the disposal of hazardous wastes and where these wastes can be properly disposed of. If you can't pump into the rain gutter system then I would treat the water with declor (sodium thiosulphate) and put it on the lawn or in a flower bed of into the storm drain if the garden option isn't available.
You don't want to deal with possible municipal violations for failure to purchase some declor or to pump into the rain water (sewer) system if that is available. Your wife and baby don't want to visit you in jail and you don't want to give any money to the court when you could spend a few bucks at the LFS.
And, come to think of it, you could dump this into your neighbors pool or water fountain if they don't mind. These are the same folks that might call the city if they observe you dumping funky water in the street. I hope you don't have neighbors like this, but some of the nicest people on my block have told me they called the city for similar minor infractions when they saw a neighbor doing something minor that they didn't like.
Barking dogs, parked cars, and dumping aquarium water in the storm drain, etc.