6 dpo or 7dpo?

Yasmine • TTC baby #1 with PCOS 💘

I got my positive OPK on cycle day 16 as I logged it into the app it is showing I “ovulated on the 17th and am currently 6dpo.. but wouldn’t I be 7dpo? It’s my first time using fertility friend and I want to get it accurate so I know what days to test!

Thank you 💗