What did you think aminocentesis was for?
I carry an abnormal 18th cromosome, my first child miscarried, my second tested for tri 18, but was inconclusive, and we didn't know untill birth if it was positive or not, 3rd child, a girl, lost pregnancy, 4th a son, delivered premature but healthy. We knew with each child there was a chance of loss, both of my sons have my healthy 18th cromosome, and a normal one from thier father. Knowing there was a chance of an abnormal situation, meant we could get the hospital team and specialists ahead of time to intervine at birth. My point? Without the testing, we would not have had the medical team in place to handle tri 18, and the crainial surgery my oldest son needed may have been missed, cusing more long-term damage.