Finding out the sex ?

When did you guys find out the sex of your baby ? I didn’t get to find out the sex of my baby until 20 weeks at the anatomy scan. I’m currently 12 weeks (will be 13 weeks soon) and thinking about doing blood work but if I’m close to being able to find out the gender then I’ll just wait to find out. What’s the earliest you guys found about about their gender ? Has anyone done the bloodwork ?