I don't know that one. It might be best to call your vet on Monday, was she seen after the puppies were born? I only ask because I have heard that sometimes not all of the puppies are born and if one is left inside it can cause a terrible infection.
Anything up to 6 weeks - just like with humans , is pretty normal......But, more important is how much is she bleeding and what color is it? Is it very dark red/brown or a watery pink or something in between? If its still very dark (more of a true fresh blood color), then you may want to have her checked.