I Had An Echocardiogram Done Today, Because Of Feeling Lightheadedness

I had an echocardiogram done today, because of feeling lightheadedness and dizzy to the point where I would almost pass out... There was lots of red and blue and some other colours too.... I am very worried as she was also doing graphs of my heart rythm and it sounded off. My doctor told me there was an irregularity in my heart beat and that's why I was sent for testing.... I was born with a murmer that hasn't been active for a long time, is it possible that it's just my murmur?