I spent £60 on test I started tested 10dpo and got a very very very faint line, the type you have to hold to the light and squint and think you are hallucinating! After the first test I started becoming obsessed with seeing the line getting darker, I only got what I would class as a very clear no doubt about it BFP the day after AF was due. I didn’t even get a BFP on the day my period was due on a digital!
I would advise waiting but I know that’s super hard and I didn’t wait, I think either be prepared to spend a lot of money and do multiple test throughout the next week, or wait till AF is due.
There is literally no benefit whatsoever to knowing that you are pregnant at 9 or 10dpo. As someone who has been there, trust me on this. The first trimester drags like a beast anyway. It gives you five more days to worry about whether or not everything will be ok, and you spend shitloads of money so you can obsessively poas and over analyse whether your lines are getting darker or not.