My cat Windsor is pregnant with her 2nd litter. Her 1st litter went very smoothly and she birth 5 beautiful, healthy kittens (3 girls, 2 boys). So then this morning around 830am she gave birth to 1 kitten (that to me looks and behaves like a full term kitten). Mom has been caring for this single kitten as if all is well with her new baby. Here's where my concern comes in...I can still see and feel more than 1 kitten, at least 2 more babies in her belly. The mother is not in destress or really even looking and acting like she is still in labor. Is this something I should be worried about and need to immediately seek a vet to take her to. Or is this normal?