oracles are the same sensitivity as FRER. so u can use them from 9-10dpo (or in my case, start testing as soon as 5dpo because im crazy like that LOL.
Ive had 3 months where Ive gotten those stupid indent lines. (ill post my pics later as im going out now). All of them i got faint lines that never got darker. But my experience with chemical pregnancy was alot different. I got a bfp on 10dpo when AF was due, I kept testing and watched my line get slightly darker over about 7 tests. Then about 4 days later got a lighter line, I had a little bit of spotting, but then it came back with a vengence. I kept testing while my "AF" was here, and i watched my line fade and go back to nothing over about 3 tests.