7, 8, 9 DPO? How early?

Allie • Married to a hunk. Have a 5 year old boy, 3 year old girl, and baby #3 is coming Feb 2020!
What's the earliest that I can test with morning urine that will show a faint line? I know, I know, be patient. I just want to know how early y'all recommend and if any of you ladies have gotten BFPs by testing early.