When i had a stress echo i had palpitations and the cardiologist said they were benign ectopic beats and nothing to worry about. what does that mean?

Not serious: Usually “benign ectopic beats” means premature atrial or ventricular contractions that occur occasionally but are isolated & not likely to lead to a serious rhythm problem. A lot of people have these & don’t even notice them, though others do, like yourself. There are other types of ectopic beats that are a risk for serious rhythm problems & require further evaluation & medication