She is about to Pop

Our cat, Mercedes, is about to have kittens. The first litter she had 3, the second she had 2 (one died within 2 weeks and the living kitten pictures can be seen on my knitting blog). She is on her 3rd litter right now, her tummy is 3 times as big as her head. She waddles back and forth from the front to the back yard. I thought she was going to have her kittens Sunday but she is holding back on us. I think this time she may have 4 kittens, but I don't know for sure. All I know is that Mercedes is keeping us in suspense.