When to reveal multiples

Ashleigh
My husband and I found out a few weeks ago that we are having twins! It is our first pregnancy and we have shared the news with our family and closest friends, but not the general public. I wanted to wait until my 12 week appt which is in about 2 weeks. I was talking to a friend last night and she said  maybe we should wait to announce there are two until late in the second or third trimester, "when you really know there will be two." What do y'all think about that?