I am really upset. I examined one of my pregger rats, and she has an obvious tomor on her side, about the size of a half of a peanut (you know, the peanuts with only one nut inside.) I don't know what to do. Should I just humanely euthanize her? I thought of waiting for the babies, and she does not seem to be suffering physically; still eating and drinking and alert looking. Any advice?