Calcification in heart

I just had my anatomy scan & the sonographer told me they found a small white spot in my babies heart & called it a calcification. She said they were very common & the doctor told me since my AFP came back normal & everything else on my scan came back normal that Down's syndrome was not an issue & not to worry at all. I'm a first time mom, So I'm still freaking out lol any other moms have this happen?