I'm so scared for my baby

Yesterday at my 20 week scan I was told my baby had a small calcification on her heart. They said it could be the muscle, but will check again at 28 weeks. For those that don't know, this is also a soft marker for Down's syndrome. I've read and read and read articles on this and most have said the baby will be healthy. But I'm just so worried, she's my first, and I feel so helpless. They haven't told me my results from the blood work that will say if she has any abnormalities, so that scares me more. Any momma's gone through this?