Echocardiograms often end with a scan of your heart looking from below ie the abdominal region. This is a normal part o the scan. Echo machines are not set up to look into the abdomial organs and the technicians are not trained to do so and would not do so in general, so I very much doubt it has anthing to do with an aneurysm
. It might be something to do with th Pericardium
, the sack that surrounds the heart and a structure that is looked at from this view.
Generally, if it was immediately life threatening, they would not let you home but would have admitted you to hospital after the scan.