What DPO am I 🧐🧐

Cristal🌹💋🥀Reneé • Wife & Mom to twins Kenzie & Christian. One angel on Earth, the other in Heaven

Do you start from the very first time you see a surge or from the last day of the surge? I noticed my test line was darker than the control line on the 17th. Then it gets super dark on the 18th, but it doesn’t start to go back down until going on the 20th. So I’m trying to find out how many DPO I am but don’t know what day I actually ovulated🤨

Some lines lightened up over time but they were much darker after the 3min window