Why do people announce at 12 weeks instead of 14?

I have had 2 miscarriages (1st and 3rd pregnancy). This is my 4th pregnancy and second child. We are waiting to announce until we are in the clear but I see a ton of people waiting until 12 weeks instead of 14, when the second trimester starts so I’m just curious why everyone’s magic number is 12 weeks? TYIA

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