Hey, congratulations on Diamond having pups!
The discharge can be very normal, and can extend even out to a month or so. Things we should be seeing to help us know this is normal lochia discharge include:
1) Diamond feeling good, nursing normally, etc..
2) The discharge should not be foul or malodorous. I mean, it will have a smell, we just don't want the smell of infection or rot that might indicate a piece of retained placenta
3) I should be gradually decreasing, although we might find we go a few days and think we're done and then suddenly have another bit of production.
The uterus is involuting or shrinking to it's original size and the placental attachment sites are healing and finishing their oozing and leaking after the placentas have detached during whelping. Sometimes this discharge can pool in little dilations of the uterus and then be released when the uterus shrinks a bit more. All normal.
So look for decreasing volume, not gross or smelly like rot, and a healthy Diamond.
Hope this helps! If I can provide more details or cover something better, please let me know.