If a doppler scan of arms and legs comes back negative for blood clotting, does that mean there are no blood clots in my body anywhere else?

No, but...: It's extremely unlikely. Unless you have other symptoms. It is possible the a small clot travelled to your lungs and would present as a pulmonary embolus. Ct is the best test for that. However, a blood test called d-dimer would be positive. If your duplexes and d-dimer are negative, it would be extremely unlikely to have a clot anywhere in a patient your age.