The key to the pill is regularity. Also remember that the first month when she is on the pill you will want to use condoms the whole month. Also, there are some medications that can cause the pill to fail (mainly antibiotics), so if she is on those you need to use a condom as well. As long as she is taking it every single day, the failure rate is very, very low. My wife has been using the pill ever since we have been married, and our two kids came only when she got off the pill specifically for that purpose.
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