Hi Mei2, i went for my week 9 scan on tuesday and Dr sadhana talked about the 1st Trimester screening (Oscar) cos i'm not that young anymore.
She mentioned there's a new test called Harmony test currently available only in private hospitals. It's a blood test that detects fetal trisomies 21, 18, and 13.
Although it is still a probability test, the accuracy rate is 99%. It's not as invasive as an amino, that carries an amount of risk.
The down side is that it cost around $$1800 to S$2000.
Get that 2nd opinion first and talk to your gynae about the Harmony test if you are interested.
All the best. *Big hugs*