I need some answers or advice.. I would go to the internet but it freaks me out!

when I was pregnant with my son I had so many ultrasounds due to my Dr saying he has a echo or something like that in his heart. and when he was born, they did tests again and it still was there & they said wait until he is like 6 months to see if he grew out of it. I have an appointment with a ped of cardiology for him Wednesday. I'm nervous and don't know what to expect. he's perfect and healthy and see nothing wrong with him.. ??