They did this for us at Maidstone at my 20 week scan so I think you will be fine x
I have no experience of this but there are signs in the waiting room that says they won’t do it, clearly from the other replies this isn’t always true but it might be a depends who you get scenario
@Katie that’s really strange because they offered it to us as we want sure if we wanted to know or not! And the envelope with the paper inside was a proper printed “it’s a girl” paper so looked very official. Wasn’t just written on paper if you get what I mean. Like you say maybe it depends on the sonographer x
If you ask them to write it down when you go in rather then tell you it should be fine hun as that’s what my sister did at Maidstone hospital but if you’re that worried about them only telling verbally then take that friend with you and get them to tell her once you’ve left the room x