HPT BFN when you're actually pregnant: How often do you think it happens?

[Moondance]

No, I haven't touched the pill since I was 16 years old, now 28.
Last year, my menses settled down to a 40 day cycle which at first I thought odd, but then when 5 months later, it was still a 40 day cycle I figured thats just where my body settled. It never bothered me, it meant I got my periods slightly less. I hate periods, so no.... not anything to do with the pill.


but the only reason I gave the info as to me being late was for background as to why I'm asking... but thats NOT what I'm here for.... I'm here looking for statistics, articles, personal stories, about whether false negatives are more prevalent than we hear they are. I didn't come here for advice for me personally. Thats not why I'm asking.