Doctors are already seeing blood clots in many COVID-19 patients. Strokes, heart attacks, and pulmonary embolisms appear to be much more common than with other forms of viral pneumonia. Some hospitals have incorporated blood thinners into their treatment protocols.
I also had an interesting discussion with someone who is apparently some kind of medical researcher about zinc and blood stuff. This was very helpful to me and my sons in trying to recover our energy levels, which also firms up my suspicions that a. we had the infection and b. my mental models are less wrong than some of what is out there.