I got my first BFP on 11 dpo.
I too had false negatives testing before AF was due, testing on the day AF was due and testing one day late, finally when I was four days late it was positive but every one is different, with my last pregnancy I tested three days before AF was due and got a positive. My advice would be if you can stand the wait, wait until you are actually late to avoid false negatives, good luck to you!!
I have gotten a false negative testing before AF was due, so waited and got BFP on day AF was due this time. However, I suspected I was pregnant the whole week before AF was due, and sure enough.
If you had a pretty normal cycle you were maybe 12 DPO when you found out.
DPO is Days past Ovulation
I have no idea with this DPO terms, but the earliest I got a BFP was 2-3 days before my missed period. So I don't know how that is in DPO terms maybe someone can help me out.
I got a faint positive at either 9 or 10 DPO. I ordered tests online from early-pregnancy-tests.com and they worked great for me.
Got mine at 11 DPO but I'm sure I could have at 8-9 DPO since they were so high at 11 but I'm carrying multiples so that's why they were so high.
i got my BFP with FRER at 12dpo
The soonest is 12DPO by blood and you can take a pregnancy test 5 days earlyer than when you expect your period with an early test. Good luck