Hi, I'm A Few Weeks Out Of The Hospital For

hi, I'm a few weeks out of the hospital for 6 days with pneumonia, I've had exrays and have been on anti biotics and 5 days of steroids after being on antibiotics for a little over a week, the exrays showed improvement, when in the hospital they ruled out an embolism, I have been coughing and working out the phlegm for a number of days, I go for another exray on monday and back to the doctor for a follow up the following day, tonight while laying back watching tv I coughed up what I thought was some more phlegm and when I went to spit it out it was blood not phlegm and I have coughed up a bit more, I have never coughed up blood before and don't feel different but was wondering what was going on