I'm sorry to hear about your mix up. The same thing happened to me yesterday...I called my OB office to see how much water I needed to drink before my appt. on 5/12. The receptionist told me that I was only scheduled for a check-up. I explained how I was supposed to have my 20 week u/s that day, and she said.."I'm sorry, we don't have you scheduled for that."
I was so MAD! Come to find out, "I" was suppose to schedule my appt. myself down in Radiology (I guess they don't do the 20 wk u/s in my OB office.) Anyhoo, we got it all straightend out and they scheulded me an u/s that day before my check up. I would have been so bummed if things had been screwed up because my DH, and my parents are both taking the morning off of work to go with me.
Your right though, maybe there is a reason why it didn't work out yesterday. Your baby might have been in an uncooperative mood. The 8th is right around the corner.
Sending you OPEN LEG VIBES!