The birth-control pill failure rate isn’t from missing a day of pills. In fact, many women can’t get pregnant for months after quitting them. It’s from the fact that many women’s simply don’t work the way the pill manufacturers would like them to. So whereas condoms inevitably fail eventually, yes, many women use the pill for a lifetime without them failing... that they know of.
As I mentioned, however, modern birth control pills usually use minimal doses of estrogen to avoid the serious, nasty complications of estrogen, and maintain the effectiveness by adding progesterone which can prevent the babies from being able to integrate into the uterine lining successfully. The drug companies deny this happens ... progesterone also makes conception more difficult ... but despite the progesterone, 9% of the time a pregnancy is noticed. Since the effects of progesterone also certainly make the uterine lining less hospitable to conceptions, we can know that some of the babies must fail at integration. We just don’t know how often, because no studies have ever been performed, since the notion of deliberately causing conception so you can see if the baby gets killed is abhorrent to the most militant of pro-aborts, and those people don’t want to know the answer.
>> but despite the progesterone, 9% of the time a pregnancy is noticed.
So, this is just a case of statistics manipulation by interpolation and possibility scenarios? That makes sense.