Went in for my NST today and I sat there for 30 minutes just to have the doctor come in and realize…

Went in for my NST today and I sat there for 30 minutes just to have the doctor come in and realize that the machine wasn't working 😣 like how did the nurse not check before ? She ruined my appointment and now I have to go back and it's so hard since I don't have a 24 hour babysitter to watch my 3 yr old 😒