All those who were on BC when you/wife got pregnant.. were you also using a barrier method (condom/diaphragm) simultaneously? I know some people think the whole point of going on BC is to have sex w/out a barrier, but if you're on BC to definitely prevent pregnancy, I'd say the hormones alone are not enough. It's not 100% proven, especially with "regular use" (not "perfect use"). Humans make mistakes, forget to take the pill on time, have bodies that don't like artificial hormones, etc. Hence I consider it a good idea to use an additional barrier method if you definitely DO NOT want unplanned pregnancies... but that's just super-paranoid me.
I do wonder if the medical establishment (or at least BC pharmaceutical companies) doesn't just have us all hoodwinked into thinking BC is 100% foolproof... or they just mean well, but underestimate human error.

E.g. that whole shake-up about the Patch (high hormone levels) was unbelievable... I use the Ring, which is also fairly new, and wonder if anything bad will come out of it in a few years? Meh, we shouldn't believe everything they tell us, that's my point. Take whatever precautions necessary to protect your own interests as a person and a couple: for me, that means BC + condom!
