How to count DPO

Sara • MC 10/2015 at 4 wks & MMC 10/2016 at 8 wks + 2 days. Currently pregnant with my rainbow, due 11/2. 🌈
I've tested positive for LH surge 3 days in a row now. Usually only lasts 1-2. I don't temp, so how do you think I should count DPO? i.e. Is 1 DPO 2 days after the first positive LH test, or 2 days after the last positive? The TWW is the worst 😂