I have had two girls in with a male over a month ago. One of the girls dropped their litter yesterday so I knew that the other would be dropping any day now. She was looking HUGE this morning and I noticed that the had kicked the boy out of her nest before I left to take the dogs for a walk, and he had one pink under her. I assumed she would have more because she was wayyyy bigger than the other girl, who had seven, but I just checked and there is only one still. I see a bit of umbilical cord as well... I'm just a little puzzled. I've been breeding rats for a while now and I haven't had any of them take this long before. Is it normal or should I be worried?