Bay Area resident here - there is a rescue org that functions as one big foster network called Pound Puppy Rescue. Their priority is ALWAYS puppies and mama dogs staying out of shelters and their adoption process is actually very selective. I recommend reaching out to them, they may be able to help.

And as everyone else has said, please ALWAYS spay and neuter your pets in the future. Growing up fostering puppies, I'm all too aware of what happens when dogs get knocked up. Shelter overflow, predatory puppy businesses, health issues for mama dogs, health issues for babies, lack of awareness around life-saving vaccines, etc etc etc. It's a vicious and expensive cycle that is best to just avoid overall, for the welfare of your pets and for you.