Hi, I'm 35 Years Old. I'm 18 Weeks Pregnant. I

Hi,

I'm 35 years old. I'm 18 weeks pregnant. I had a panorama dna screening test done a couple weeks ago. All my results were fine giving me a low risk of 1/10000. Today, in the sonogram the doctor found a white dot (eif) in the baby's heart. He told me it was not necessary to do an amnio based on my screening results, and that little white mark sometimes it just goes away.
I'm worried!