My cat gave birth 3 dys ago. Today, I was petting her, and felt a lump in her side. When holding her, I can feel the lump (which is about an inch and a half across and fairly thick, hard, and bony like a kitten) near her crotch area. My neighbor says that it is just her uterus shrinking, but i believe that it may be a dead kitten which did not pass through. Am I being paranoid?