The pill itself is 99%effective, but decreases to 97% (this is an average of many people that either became or did not become preggo) when you include outside factors like other drugs etc.
so chances are about 50/50 that you will have a child if you have sex 50 times. It's a crummy lottery, and you choose how many tickets you want to buy.
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"Asking a bomb squad if an old bomb is still "real" is not the best thing to do if you want to save it." - denim
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