It really depends. I wouldn't take a negative as definite until after my period came, because there's such a range for implantation, and then it takes another few days for HCG to build up.
You can click around to different days past ovulation here and see results as reported by women using the site: https://www.countdowntopregnancy.com/pregnancy-test/dpo-chart.php?dpo=10
It varies quite a bit by brand, too. Some are much more sensitive than others, some women for some unknown chemical reason respond better to some tests than others, some tests are prone to evaporation lines that people take as positive, and so on.
So, as far as testing now, it all comes down to personality and budget. I'm the type that just can't wait, so I have a bunch of super cheap Wondfo tests and start testing early. It can be disappointing to see all the negatives, but the suspense, for me, is even worse. Some women prefer the suspense to the negatives. And of course, if you don't order your cheap tests early enough, you could end up spending a fortune in early tests just to end up not pregnant at all.