How many DPO do I need to be to test?

Eva
Hi Guys, 
Wondering what's the minimum amount of DPO before taking a test ? I've seen some of you test at 9 DPO and even earlier but would love some advice on this ? I'm currently 12 DPO and 3 days past AF due date. Don't want to freak and test too early, then face disappointment. Baby dust to all ✨✨✨✨