Hello! Today I had an appointment with a geneticist who said that Down…

Hello! Today I had an appointment with a geneticist who said that Down syndrome is questionable. But according to the tests, there's nothing like that visible, she said. We need to undergo further examination in a special apparatus, she said they will take water from the umbilical cord or something similar to fully confirm everything is okay. But I don't want to go through it! Can you tell me if anyone has experienced this before?