Ultrasound results! A little worried...

Went in today for my 20 week ultrasound and met with the the doc right after.  She was able to tell me the results and the ultrasound detected a bright spot on the baby's heart and it's called an echogenic intracardiac focus (or EIF).  I'm going to have another ultrasound done to focus on the heart that can detect any problems.  She told me that she is not concerned about it and sees this all the time and it usually ends up being nothing.  I'm waiting for the ultrasound department to call me to schedule it.  I'm nervous.  Anyone else experienced this of know anyone who has?  I'm trying not to worry but I can't help it.