[animalcraker]

Your post wasn't entirely clear Is it the same sire for both litters? Is it the same mom for all 4 litters? How old are the pups that just bred? How long ago was she bred? How far along in her heat cycle is/was she? What experience do you have in raising and breeding dogs?

Without knowing what's actually going on we could all just speculate and assume, but unfortunately that's not going to help anyone.