From what I understand, most heart murmers are benign and shouldn't cause the person any problems. Others, that are pathologic, are usually to do with a defect of the valves of the heart. It's unlikely to be the second kind if you haven't been told of a significant murmur before this, as it's usually congential (from birth), or as the result of rheumatic fever or endocarditis (in which case you'd know if you'd had those).
My dad was born with a congenital heart valve defect, and when I was a teenager my Doctor heard a heart murmur in me too. They had to check it out because of the family history, but it turned out to be nothing.
It is possible to have a murmur detected and have completely normal cardiac structure and function. Murmurs can be detected in most young people at some time or another.
Keep in mind that the heart has to work a lot harder when you're pregnant than when you're not. You have more blood pumping around at higher pressure. Murmurs can be caused by blood being forced through a tight heart valve.
It's good to get it checked out. Hopefully the news will be good - then at least you can stop freaking out about it! The cardiologist will probably just hook you up to an ECG and take a print out of your heart rhythm that way.
Hope that's helpful? I'm not sure if I explained myself clearly!!
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