The tech was lovely, and talked us through the whole thing, unlike other techs in the past. She asked us beforehand if we wanted to know the sex and we said that we didn't, but we would be looking for evidence on screen and she was really fast and careful about not showing us anything near the foetus' nether regions. Despite her care we both thought we caught a glimpse of penis, but not nearly enough to be sure.
I was really unsure about waiting to find out the sex. With Asher we found out but tried to avoid telling people and that was OK. This time I thought that I would ask at a future ultrasound - one of the few joys of a slightly higher risk pregnancy and a conservative obstetrician is more looks at the growing baby - but this morning as I was waking up I started thinking about that moment straight after delivery and the cliched announcement and I got really excited by the idea. So it looks like we won't find out. Either way I'm happy - it looks like we have a healthy baby on board!