Well it looks like you have your hands full with all the dogs being young. You’re lucky to have 3 bedrooms so you can separate them.
My suggestion would be to have the males neutered right away, do not delay as Cali can get pregnant again very soon. I would also have Cali spayed as soon as she weans her pups. That way you won’t have to deal with a repeat pregnancy, as you have found out accidents do happen.
I wouldn’t introduce the pups until they are at least 6 weeks old and NEVER, NEVER leave them alone with the males. I don’t know if Cali would appreciate the males being with her pups and one of the dogs might kill them. Maybe later you can introduce them slowly, having someone holding the males by collars and leashes, you need another person besides yourself for safety. It would just take one snap and it would be over. A lady on another board tried to introduce another dog to pups about the age of yours. The dog took a huge bite out of the back of one and it had to have stitches.