Um. I want to say I got a squinter on 9dpo, but my obvious lines and digital at 10dpo. With my last bfp, I got a positive 9 days after DTD and 8dpo 9based on cramps). We hadn't had BD for over a week before that or a few days after so I can safely say that was when we conceived.
https://babyandbump.momtastic.com/pregnancy-tests/2342099-mind-playing-tricks-9dpo-update-bfp.html
Is where I posted that test. Although, once I click on it and make the image bigger on my computer that is kind of an obvious line haha so maybe I would have gotten something on 8? Shrugs.