Shaw's Baby

In scenes of Saw "giving birth" or having baby/growth/parasite removed. Since the release of those images, I might need to be corrected here, it seems by reading a lot of threads that it is a conclusion that its a "squidy" thing. Both my wife and I watched the images frame by frame and our impression was of seeing an "umbilical chord", and it moved a lot because the creature and Shaw were moving a lot. This makes more sense and is more horrific than just growing in you, it uses you to help it grow. That makes sense to me because something would gain weight and size from what it takes and it attaching would work both ways, it could alter her from produced a more conducive environment to emotional attachment (that's just an example because frankly emotional attachment and braaain control seem to really not fit). Pregnant women have their emotions and hormones changed in many ways. Am I wrong? Please correct me if possible