That is a great question - kind of both really - because I am basing the number DPO I am by my OPK's.... and my AF date fluctuates each cycle by 1-3 days.... so what I think to myself is "when is the latest day AF would arrive?" and then if she has not by that date, then I would test. Does that makes sense?? So right now I believe I am 7dpo - and my cycle can be anywhere from 24-27 days. So if by CD28 morning I have not seen any sign of AF, then I will test. By then I would be 14dpo.
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Re: DPO or days before AF?