It is so wonderful that you were there to save her...
The pit bull hypothesis wouldn't be impossible! At one of the clinics where I worked a few years back, someone brought in a beautiful little 15lb beagle who had a lurid affair with their pit and had a litter of pups. The owners were kind of naive-- they hadn't had them altered, and they thought that the pit would be too big to father any pups with the beagle... Momma, Daddy and pups were all fine, but Daddy got neutered three days after the owners found out that Momma was expecting. =p What was crazy was that the little beagle didn't even need a c-section-- she delivered her pups all on her own!
Whatever your pups might be, I'm sure they'll be beautiful.
