Rainbow baby announcement ideas

For those mama's who are either pregnant with their rainbows or mama's who have already had theirs, how did you guys announce? Or how do you plan on announcing? We did a sibling announcement back in January before we lost our babe, but I don't think I want to do the same thing. I've contemplated waiting until Halloween (I'll be 20 weeks around then) but I don't know if I can wait that long!