Types of Down syndrome test available

I’m 41 this year and at 5.4 weeks in my 1st trimester now. Has 2 healthy boys through normal delivery. Due to my age, I would like to know what are the options / series of tests available to test for Down Syndromes / abnormalities development. Any suggestions? What are the tests that the Dr will advise to go for ? Thank you for the advises if any.