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It might be a sign of affection from your friend that she mentions your bubba's name, it might even be that this is exciting for her. I think if she was a good friend the last thing she would want to do is cause you any concerns or stress especially when you are pregnant. It might even be a nice sign of respect for you. So there you go three 'maybe' good reasons why she is using bubba's name already !!
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Maybe put a fb status up saying you are thinking of new baby names stating that you have heard so many others saying your baby name that it doesn't feel special anymore! Hopefully she will get the hint! And in the meantime...delete delete delete!