You need to be evaluated by the echo and the cardiologist to make certain your heart is OK and that it is safe to play sports.
I would not be worried about anything. Wait for the echo results from your Doctor. People live with these "murmurs" all their lives with no problems at all. The echo will show how well your valves are working, the size of your heart, etc. You will be fine though.
P.S. I am no Doctor....work as a Med Asst for a Cardiologist. See this a lot with young people. You will be cleared to play basketball.