Just got results from 12 week/nt scan.

Laurel • 👼🌈👶👼👼 due 11/6/21 with a 🌈👶

Flagged as a chance of 1 in 87 baby has trisomy 18. Doctor has referred us to the next stage of testing (I think the “needle test”). I am so devastated and scared. Has anyone been through this? What is the chance of a false positive?