I am in no way an expert, but I would say go by ovulation dates and add 120-125 days. I find in my experience, this is much more accurate that post ovulation shed dates. I think Jeff Ronne even said before that females are usually more likely triggered to deliver around 120 after ovulation than they are a certain amount of days after POS, But the POS is good to go by if you miss the ovulation.

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