With aspirin there can be bleeding within the stomach,
and as it passes through the system there would not be any bright
red coloration that you seem to indicate.
Contact your doctor. Plavix and aspirin is not recommended by AHA/ACC more than a year after a stent implant to avoid the possibility of blood clots. You probably should have been off plavix a year or so ago. I quite plavix after a year subsequent to a stent implant. Did not require weaning off, etc.