My suggestion is that you consult a physician. It is possible to determine if you have clotting in your legs via ultrasound examination.  Also, there are tests to determine if you have a genetic disposition toward clotting.  
This is worth checking out because once a blood clot forms in your legs it can migrate elsewhere such as the longs (pulmonary embolism) which can be quite serious, even fatal.  Symptoms of a PE include difficulty breathing or severe pain in the back;  if this shows up you need to get to an emergency room right away.
      
      
    15 years