gender reveal !!

Ok lady's ! Sooo I have a doctors appointment and my ultra sound to find out the gender of my baby ☺️ on March 8th! The only thing I'm struggling with is if I should know there and then the gender... Or have them write it in an envelope and give it to my boyfriends mom so they can do a little gender reveal party. FTM what did you guys do ?🙄🤔🤔