My cat gave birth to 4 kittens this morning but she is still purring at meowing at me does this mean she has more kittens?

It is quite normal for a she-cat to meow a lot after her kittens are born so please do not worry about that.
I know that sometimes one kitten can be delayed by up to several hours but I would think that if your cat has delivered 4 kittens already, then she should be done delivering for this litter.