Telling work

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When is everyone telling their work they are pregnant? I’m 11 w 5 d and my shirts are getting tight. I only work 2 days a week at a Pediatrics Office and stay home/watch kids with my 2 yo 3 days a week. When should I tell my job?? I was thinking about next week but I won’t be at work since it’s thanksgiving/Black Friday. So then I will be almost 14 weeks when I tell them.