Heart issues

So I've had my mid pregnancy ultrasound. Everything was perfect....except the heart wasn't very clear. They couldn't quite visualize what they wanted to and were concerned there may be a defect. Had a follow up with a different OB and still baby boy was in a horrible position to get a good look at his heart function but they are still concerned there is an issue. Now I'm being referred to a pediatric cardiologist.

Everyone is saying not to worry because there is no immediate danger to the baby. Nothing will need to be done until after birth IF anything does need to be done. Had anyone had to deal with this kind of thing?