Whats the earlyest week you can find out your pregnant?

Sonia • Mom To 3 Handsome Boys Ethan Liam 2-12-19 & Kaiden Aiden 12-21-20 💙💙💙👶👣 & Gerardo Eli 5-16-22

I just found out I'm pregnant I'm 3 weeks & 3 days. But got a really faint line.