Did with TMC too! :) Scan followed by blood test in a day. I received a call the next morning to inform results are good and got the report during my next appointment (4 weeks later).
I did my scan first, followed by the blood test! They called within a few days to say everything is fine, and I received the report during my next appointment. :)
You can actually find out about it through google you know. https://www.cordlife.com/sg/antenatal-screening-tests-for-chromosomal-abnormalities
They will do a blood test first. Then a few weeks later will do a scan.