If you have any reasonable doubts or questions, you should call the doctor regardless of what we tell you might be normal. It may be normal, but your doctor needs to be aware of what you are seeing, and you want your mind at ease. Extra stress does not help you heal.
I called my doc - he said things were normal, but that was me. I will add, though, that a single small drop of fresh blood can scare the life out of you when it tints the whole bag. Been there.
I kept a diary of each bag - quantity, debris, clots, color. It was very helpful while we were trying to sort out urinary tract infections.