Gender

So those of you who are PG and don't know the sex yet, and those who are ttc...if/when you do get PG...are you finding out the sex at the dr, making it a total surprise (when he/she is born,) or having a gender surprise party? Thinking we'll do a gender reveal. Have the dr write it down and seal it in an envelope and handing the envelope to the balloon person/cake person etc.