At how many weeks/ months does it take to find out the sex?

About 16 weeks

I don't find it until my 20 week mark

My drs always says 18 is the earliest to be safe but some can find it earlier through blood test

I had the harmony test I found out at 11wks

What's the harmony test? @2ndprincess

i want to get the test cant wait

Basically http://www.ariosadx.com/

That's a link on what it is @california12632