There are some specific and some non-specific ECG changes. The most specific of ECG changes are definite alarm signs, even in the absence of symptoms. As far as the non-specific ones go, their significance is much less certain in the absence of heart-related symptoms. This forum is littered with questions like this one, most of which turn out to be nothing.
Don't sweat this too much until you have seen and been assessed by a cardiologist.
QDM