I think at least 10 day after ovulation if you have the really sensitive 1s or day your period is due
You can get positives from 8dpo I’ve seen it all my former TTC friends are now pregnant and got positives by 12dpo (faint but defo there)
I think it all depends on ur body. They say wait a week after missed period but i took it the next day it was supposed to come and i was 2wks 3 days😭😭