Does DPO start the day after your fertile window ends?

Question

Does DPO start the day after your fertile window ends? Sorry don't quite know How that works. Eager to have my TWW over with so I can test already advice/info welcomed!  TIA!

Answer

According to the genius chart it does. To be honest I'm not really sure, but I guess it's the day after you get a positive OPK if you are using those. If not then I would say it's the day your fertile window ends, but you could ovulate any day within that window.  So you could be off a couple of days. If this ramble makes any sense to you.

Does DPO start the day after your fertile window ends?

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