I had the internal probe at my 12 wk scan, when she came towards me waving it around I was petrified they are huge and really long lol!! Even my oh blanched, but when she inserted it she didn't even really look, it took 2 secs then she was back to focussing on the screen, it wasnt as bad as I thought it doesn't actually go in very far, the worst bit was when she got so preoccupied with getting the baby to turn right for the nuchal measurement she seemed to forget where it was placed and started energetically waggling it around to make the baby move, I nearly hit the ceiling!!!!! Not something I'd repeat in a hurry lol!!!