So this is a dumb question....DPO question

Caitlyn • Rainbow baby boy born 8-7-20

When talking about DPO, does it start after your green days, or does it start on day one like your period does? For example, would the 25th be the first DPO, or since the 22nd is my peak day, would the 23rd be the first DPO? Please help!!

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