Pregnant dogs

Hello all. Backstory I have two female dogs, one Boerbel and one German Shepherd dog. They used to get along just fine but suddenly the Boerboel became cruel towards the GSD and now GSD basically lives in a bit of fear from the other. We have a male dog and it looks like he has impregnated both of them 😩

Now still the Boerbel is cruel to the GSD and I’m worried about what will happen when the puppies come. Should they be separated? I’m worried that the vicious one will kill the GSDs puppies or she’ll eat her puppies because of the environment. Help!