I would like to know your age.
First and foremost thing is (though listening to heart -auscultation may give good idea) is to see your cardiologist an echocardiography
will exclude ASD ( also RVH as a result of PAH or PS), as there is no mention short PR interval I can exclude WPW
syndrome. If echocardiography is normal, you have no other complaints like palpitations and your cardiologist agree. One can stop worrying about your EKG then this is a normal variant (meaning thereby you are having incomplete RBBB) which will not trouble you for years but your future doctors would like to know when it was first detected.
Dr Anil Grover