Well, word must have spread around the office that I was an emotional wreck because the doctor came breezing in and immediately assured that I had nothing to worry about. Its called an echogenic intracardiac focus and its found in roughly 3-5% of pregnancies. Its like a cyst or calcium deposit, they're almost always benign and usually disappear eventually.
Now, why couldn't the tech tell me that instead of letting me wait and worry!!! Ugh. I'd be much happier in my ignorance. I don't want another ultrasound for a long time.