That can happen with lung cancer. I was told about half of the time. I don't know if that's accurate. When my dad had his lung cancer, there was a little bit of blood in streaks, but not bad. I would write it down and mention it to the doctor just so they're aware of it, because they're more familiar with your situation. If it's a great deal of blood as a change that you noticed, I would let them know right away, and see what they think.
Boy oh boy you really have a lot going on, huh? How much blood are you coughing up, and how often?