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I wouldn't expect to see any significant bleeding this far after whelping. I would want to shoot an x-ray or do an ultrasound to make sure there is not a retained placenta or retained puppy. This is why we recommend a post-natal exam 2-3 days after whelping. We can catch those issues before they are sick.
If you can get in to a vet in the next 8-12 hours, that would be preferred. If it's something retained, they may be able to get it out with Oxytocin. If not, and it's just some post-whelping metritis, then antibiotics should help get it under control.
I hope this helps, let me know if you have any other questions.