Finding out the gender

So Thursday I'm supposed to go to the doctor and found out the gender of our baby. I'm currently 16 weeks. I haven't had a ultrasound since 7 weeks. I went to the gynecologist around 11 weeks to get my ultrasound to check up on things. I told them I was moving at the end of the month so they sent me home and cancelled all treatment so I never did see my baby. I really hope that this new doctor I'm going to doesn't cancel as well but I talked to the lady making my appointment and she said that it would be fine to do a gender reveal ultrasound. Just bring 50 dollars for the ultrasound. I'm so nervous that when they look that there's not going to be a baby or something is wrong. I really can't wait any longer no have to hear the heartbeat or something.