Early pregnancy testing.

Jo
How early has anyone tested and how early did you get a positive?
If tested early and were/are pregnant was that early pregnancy test positive? If negative how long until you got a positive ?
I know we shall always wait until we are late because we get happy and then let down when we aren't. I'm wondering if anyone has ever gotten a positive before they were even late on their period. 
If possible can you share the brand of the test you used . 
🤗 thanks in advance. 
Cheers!