Calcium on ultra sound

So, I am straight up panicking. I had my 19 week ultrasound today (done at a specialist, my husband was born with a cleft lip so they wanted to check that out) and they said everything looked good, but they found a light spot on the heart. That light spot is known as a calcium buildup, and is one downs indicator. There's no other indicators, and they said I have nothing to be worried about, I'm 27, heathy, my husband is healthy. Just wanted to see if anyone else is going through, or has gone through this and how it turned out.