How many DPO do you take a HPT??

Milhu • 31yrs, DH 39... We have 2 girls, and working on our rainbow 🌈 baby.. Currently pregnant and praying this is it!!!
Just wondering when us it ok to test? I don't want to waist any hpt.. Should I just wait when my AF is due on Saturday? I'm kinda anxious and want to test.. So far I'm 11 DPO.