soft markers

[techa]

I had an ultrasound at 6weeks then at 12weeks all was ok. I went for my 20week and the results I got back were the nuchal fold is >6mm and their is a slight shadow on the babies heart. So they gave me another ultrasound and the nuchal fold was >5mm this time and their is still a slight shadow on the babies heart. They said everything looks fine but I'm still worried