3D ultrasound disappointed

Today I went to a 3D ultrasound that we paid out of pocket for. I was so excited for. However they couldn't get anything. The cord and placenta was blocking his face. I didn't everything they said and still nothing. They booked another appointment at no cost for next Tuesday but now I'm nervous I won't see anything next time and I'll have wasted the money. Sorry , just needed to vent. 😢