Should I really wait til I'm 12 weeks before announcing my pregnancy?

Yes, because the risks of miscarriage drops after that. I personally waited but I did tell my reporting boss and told her to keep a secret. Reason is I just wanted to be responsible that my work could be prone to errors and I may feel unwell during the period. My female colleagues however saw thru it, because I developed an appetite that was similar to a horse -_- not to mention the fatigue