After looking at my ECG the doctor now wants to do an ECHO. Is something wrong?

The ECG is done primarily to look for disorders of the electricity of the heart. However, the ECG can also provide important information regarding the size of the heart. So if the ECG shows that the left chamber or the right chamber is enlarged then the best way to confirm or refute this is to perform a cardiac ultrasound or, as you mention, a cardiac scan.