And ankle arthroscopy surgery today at about 6:45 am, looked down tonight, and noticed blood came thru plaster stitches gauze and an ace bandage help?

Consult Orthopedist: I would give your orthopedist an immediate call for bloody drainage in an amount significant enough to soak through gauze and a plaster splint. I also note you have symptoms of chills and headache that may or may not be related but raise concerns about local and systemic infection or postop fever. A wound dehiscence is the most serious concern as well as hospital acquired MRSA infection.

Watch it...: That's normal. Nothing to worry about. Elevate the leg so that the bleeding slows down. Avoid ibuprofen or other anti-inflammatories since they can thin the blood. If the bleeding worsens you will need to go in.