(You didn't really have 5 days of safe time unless your cycle was incredibly short. You had 5 days of safe time that you recognized.)
Doesn’t matter to me right now as we’re in “having kids mode” - but it would take something like that. I just get sick of people claiming that NFP is this super birth control thing that totally works for everyone.
Obviously most days of a cycle, a woman is not fertile. But nfp type material always sounds like you can actually identify which days those are with some degree of certainty, and for a lot of women that’s just not true.