I've yet to get a pregnant sow - upon butchering are they situated in the lower abdomen in a sack or what?
I don't know about a lot of animals, but I suspect animals such as hogs that have litters have the same basic setup. I am sure somebody will correct me if I am in error. Unlike humans where the uterus might be described as a lunch bag setup suited usually for one, the uterus on a hog looks like and oversized portion of large intestine, full of swollen areas of lumpy fluid (amniotic sacs, each containing a fetus) and when handled makes noise much like the bladder because of all the fluids. So the fetuses are sequentially strung out along this long uterus tube. That was the case here.
When the fetuses are more piglet than fetus, you see individual large piglet-shaped lumps along the uterus like a thin-skinned snake that has eaten a bunch of rats.