I have not known either time (both time it has been written down and put in sealed envelope to open after birth)

Just tell them that you dont want to know, some places offer info some will only offer if you ask. I have had scans as normal and no issue with seeing what it was.

This one person who did ultrasound I didnt ask to write it down, long story but at last appt ob did a scan and write it down for me and told me to turn away but that was 24 weeks.