With the exception of my firstborn, I have always found out by 14 dpo (AF due date) - which is 4 weeks pregnant. All are healthy kiddos!
With this one, I tested the earliest & got my BFP at 10 dpo, several days before my expected AF. I am 5+4 now, so obviously not out of the woods, but everything is fine so far... According to the miscarriage % chart a lovely woman posted here a few days ago, on Thursday my chances will be in the single digits!!!!
I think many of these super-sensitive tests can read + so early, that if one had just waited, then AF would of started as usual, or possibly a day late, so if one didn't test they never would of even known. Anyways...lol...hope that made sense lol!