I have had cellulitis for a week and it seems to be healing but instead of pus coming out its blood clots?

Hematoma: You are likely dealing with a hematoma if you had a recent injury that can account for the cellulitis. Keep the area clean and change the dressing as needed to avoid infection - or the discharge will turn to pus. If you are running a fever and the area of injury enlarges or pain worsens - see a doctor as soon as you can.

Tissue injury: Sometimes you may just get some mild tissue injury from the infection, or it may have been e.G a bruise with clots that caused the cellulitis. Either way, should be treated with antibiotics and drainage ( which it sounds like its doing by itself).