Hello,
My cat is about 5 years old and this is her 2nd pregnancy. She began giving birth at 3:30pm and gave birth to 2 stillborn kittens. She has not given birth to any other kittens and it is now 6:40. She still looks pregnant. Her last labor was not spread out like this. My question is should I be expecting more kittens?is it possible for a cat to give birth with hours between?

I think you should take her to the vet. There could be something wrong if she gave birth to 2 stillborns.