When to tell your boss you are pregnant?

Tyler • Had our baby boy in July 2016 and expecting our girl in Jan. 2019!!❤️
This is the first time I've ever been pregnant so I am really struggling trying to hold back the excitement. We decided we are going to tell our parents and siblings at our personal gathering together on Thanksgiving, so the more people that know now, the more guilty I would feel that our moms don't know. I scheduled my first appointment for December 3rd, so I am not sure if I should tell my boss right away, wait til after our family knows and then tell her, wait til after the first appointment, or be extra safe and wait til the second trimester?

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