I really hope you do not find out later what you have brought into your house for the litter of 11 to contract once they lose any maternal immunity they might have.
You have been very lucky so far. Illnesses that run rampant in shelters such as Distemper, Canine Parvo Virus, etc can hang around for extended periods waiting for a host who has a window of opportunity in their immune system. All puppies live through this window of opportunity for infectious agents as they lose their maternal antibody protection, and wait for their own immune systems to general immunity either from environmental exposure or vaccination.
While you might continue to be very lucky, IMO, by bringing in all these dogs on top of a litter of puppies, you are asking for the worst to happen.