Sounding/ mock transfer

Queen 👑 • Second FET success! Soon to be mama to boy/girl Twins 💖💙

My doctor says he will do my sounding (mock embryo transfer) on the same day as my actual embryo transfer 🥴 That doesn’t make much sense to me, even my APRN said they usually do it before the actual transfer. Maybe its due to cutting down on contact because of covid? When did u guys have your sounding? Im just nervous something will go wrong & if its the actual day of my transfer well, ill be SOL 🤷🏻‍♀️