When will i know baby gender?

If urs is a singleton u may try the Nipt blood test at wk11 like that. Accuracy is 99%. Its amazing that bb dna goes into mummy's blood. But that said, i have a fren who didn't manage to know the sex despite doing nipt, n somehow she belong to the rare few who can't detect bb sex. If this fails then have to wait for wk20 detailed scan to check tru ultrasound.