Did any of you have issues seeing the baby's gender at your anatomy scan?

Did any of you have issues seeing the baby's gender at your anatomy scan? I know it happens sometimes as the baby might not be in the right position. What did you do if you couldn't see it? Did they try again later, did you have to get an ultrasound at a later date or a blood test? Just curious as my anatomy scan is next week and I'm really hoping to find out then as it's the last ultrasound we're planning on having.