I thought I got mine at 14 DPO, but after my u/s it turns out I was only 7DPO, so got a very early one! I wouldn't recommend testing earlier than 10 DPO, as there is a high chance it will be neg regardless until then. You don't want to upset yourself for no good reason if it does turn out you are UTD!
I wish you all the best with your testing! I hope it's the result you are wanting!