I genuinely do not understand why women would lie about not taking birth control properly. So many women on birth control of any form have so MUCH ANXIETY (some increased by the method they use too as a side effect) that it’s going to fail.. I don’t get why they’d be like “perfect user but I’m pregnant :(“ I guess I get it if they didn’t know they weren’t a perfect user but…

Oftentimes they don't realize they're not taking it correctly

They might actually believe that they are taking it correctly, being completely unaware that they are making mistakes.

Like @aurielle and @Yi_eune a lot don’t realize they’re taking it incorrectly. They think because they take it every day they’re good. Not accounting for usage windows, vomiting or severe diarrhea, etc. Plus, even if you have a feeling/clue that you didn’t use it correctly, it can be extremely hard to admit that to other people, especially your partner, and face judgement (from others) or even blame/anger (from the partner).