Ultrasound question?

G • Wife, full time step-mom (they are mine in my heart), and after 6 long years we finally have our little miracle (with the help of science)!! 💕✨💕✨

Ok so I just started going to a fertility expert to see why we haven’t gotten pregnant. So I called today to begin the tests since they said to let them know when I got my next period. So I got it today. Well, they want me to come in tomorrow to do labs and an abdominal and vaginal ultrasound. So my question is... (because I didn’t even really think about it until they were closed) I’m on my period. How is that vaginal ultrasound suppose to work? I mean I know where it goes. But can I wear a tampon until before they do that and then put another one in after? I just don’t want to be all icky with a pad... 😩