NFP is actually very reliable when you use it correctly. Never had a whoopsie in 15 years of using it I think the issue comes when women either don't know their cycles properly, or don't abstain during fertile times.
I did google it, they happen but a very small minority. Who cares if they do virginity pledges? Is it harmful? If those are their beliefs so be it.
My biggest pet peeve is people constantly stating things 'that happen in America' when in fact they are most often false or a very small minority of Americans.
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