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First of all, most birth control pills are more like 99.9% effective, thought it's generally considered that under normal circumstances, if taken properly, it's pretty much 100%, all the time.
Secondly, your method of math with odds is incorrect. If you were correct, it would mean a child every 100 instances of sex, statistically. That is not correct.
What 99.9% means is the chance that, at any particular single event of intercourse, that's the odds. You can have sex 1 million times, and your chances of conception are still < 0.1% each individual time, regardless of how much you do it.
And for those with "mistakes"... everyone's body is different, and sometimes shit happens no matter what you try and do to prevent it chemically. You can't use experience to fault the pill.
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