When do you tell & when?

Sarah • TTC #1 for 2 yrs, did 4 rounds of femara, 1st IUI on 11/15 & it worked!!! ? Due 8/8/15 with twins!! ?Praise God! ?
When do you tell people you're pregnant? Do you wait until week 12 at the end of your first trimester before you tell anyone? Do you only tell family at first when you first find out? Or do you tell everyone due to excitement? 
If you wait, tell me why! (: thanks!!

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