I know most of the time it’s human error, but what else? Let’s say hypothetically a girl takes a pill every single night. Hormonal to be precise. How could the pill fail? What if she has sex 1 year after non stop taking the pill? Would it fail? Can it fail? How does a pill fail if human error isn’t in the equation?
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If you don’t leave it in the sun and don’t forget, you’re safe. The extra cases I don’t know of, probs some absorption problem of the excipients. Very specific, very rare
Edit: oh and some medication interact with it, specifically some anti mycotics, and some docs don’t know about it.
In some women, the hormonal dose of the pill is too low to prevent ovulation.
If your gynecologist does an ultrasound right before ovulation, they can check for this happening.
improper storage, improper dose, an error when the pills are being made…so many reasons. there is some cases where women are so fertile, that birth control can still fail. my cousin got pregnant with both of her kids while on birth control. the second time she got pregnant she was sure she followed the instructions perfectly.
i still take pregnancy/ovulation tests monthly while being on birth control. i’m fortunate that i can afford those. you can buy pregnancy tests in bulk (like a medical office uses). that’s what i use to keep the cost down.