If someone you knew was trying to trick their partner into pregnancy, would you tell the partner?

Friday • "In the end, we will protect only what we love, we will love only what we understand, and we will understand only what we are taught."
This has to do with a friend of my sister's, whose husband apparently doesn't want more kids, but she does. She stopped taking her birth control and another friend of theirs accidentally slipped that info to my sister. She didn't elaborate beyond that, but I thought this would be an interesting debate topic. What, if anything, would you do?

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