Ultrasound anxiety...

Kristen • Momma to 3 beautiful girls (2 of which are identical twins). Trying for final pregnancy (hopefully a boy!)
So I have had two miscarriages prior and I am currently 7 weeks and some change. I went for my first ultrasound a couple weeks ago but it was to early to see anything but the gestational sac... I have another ultrasound scheduled for this upcoming Monday and I get a call from the doctors office saying that he is on call that day so he may not be there to do the ultrasound. Really?!? Really??? Why would you have scheduled my appointment two weeks ago knowing this? Now I have even more anxiety because I may go in and not even be able to have my ultrasound that day, or that week.... it's very frustrating and nerve racking.