Basically it's part of the routine screening tests offered in pregnancy. Whatever the result, the right person to interpret it is your gynac, not google. They'll guide the next step calmly if needed.
I did this test and the wait for results felt long, I understand the worry. Remember it only shows probability, not a final answer, so try not to spiral. Whatever comes, your doctor will walk you through it gently.
My doc just asked me to do this and I got a little nervous reading about it. Did your reports come fine? I keep overthinking what if it shows something.
My gynac explained it's a blood test usually done in second trimester that checks three things to screen for risk of certain conditions in the baby. She stressed it's only a screening, not a confirmation, so a high risk just means more tests, not that something is definitely wrong. It really calmed me to understand that.