No.
They find these things out through testing. DNA and Chromosomes. The markers tell the story.
When my wife was pregnant the doctor found markers for a certain very rare birth defect that would have basically meant my son would not have survived a long out of the womb. We were open if that was the case to the idea of abortion. It was not what we wanted, but if the situation dictated it, we were opened to the possibility of having to do that and it tore us up.
We found out when we were visiting relatives in California. Our doctor called us down there and was relaying information as he had it. There were other results we were waiting for that could confirm it. We waited, crying and holding each other.
Luckily though, it turned out something like one of us had the marker, but the other did not, and he didn't have the defect. We got the call and were very relieved.
Sometimes doctors jump the gun and give out possibilities before all the facts are in. They should probably wait, but they are just relaying the facts as they become available.