Have you had an echo? I don't believe that an EKG can diagnose any valve regurgitation issues. Having any trivial or mild regurgitation does not constitute a heart condition anyway! As Connie says, with todays advanced equipment, it is considered normal.
I have not heard where mild TR was a reason to stop exercising. Because of the sensitivity of today's equipment, regurg. is picked up on quite a few people. I would be shocked if your doctor advises any limitations.
I have moderate MR and no limitations at this time.
Let us know what the doctor says.
Have a nice weekend!