cardiac outflow tract not visualized

Envy

My doctor called me today because they found abnormalities on my ultrasound. The first one being a mass of some sort they can’t tell if it’s something like an umbilical hernia or something else but it’s not a fibroid. The second thing being the cardiac outflow tracts not being seen on the ultrasound. They referred me to a maternal fetal specialist but they told me not to worry. I’m trying to not be nervous but everything I’ve read about it so far has turned out to be a signal of some sort of heart problem. I am 20 weeks and 2 days. Have any of you dealt with this before? This is my first baby.