Hcg hpt

Maria
I ordered some wonderfo hcg pregnancy tests from Amazon-- 20 ok and they just got here. I'm currently 4 dpo. I see a lot of people testing early and getting a darker and darker line if pregnant. How many dpo should I start testing w these? I also have about 4 other kinds of digital ones but I want to use those when I miss af which is due 11/3