Anyone tested 12 dpo and ...

Got a BFN and then gotten a BFP later? I'm just curious because I see all these women on here getting BFPs 8-12 dpo, but everything I read says you aren't likely to get an accurate result until missed AF or even several days after missed AF. However, when I see all the early positives here I can't help but feel like that is normal or how it should be for everyone. 

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