There are a zillion things that affect the efficacy of birth control, things they don't tell you until you end up pregnant going, "WTF???"....
Many antibiotics and other drugs affect b/c. Some vitamins affect the balance of hormones in a woman's body, making the level of b/c not enough.
Hormone levels affect it. Stress affects not only hormones but b/c, too. Some foods can affect it.
*shrugs* And there's that whole just the 1% failure rate, right place/right time, all the stars are in alignment, your sperm were on the ball thing.
For what its worth, congratulations. I don't want kids myself, but if this is what you want, then yay!
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“When facism comes to America it will be wrapped in the flag and carrying a cross.”
~Sinclair Lewis
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