Tips for 12 week nuchal scan

I could see the nub clearly on my 12 week scan and it was pretty much straight out the whole time with baby moving or pointing downward. The one I got a printout of was right after the tech shook my belly to get baby to change location to measure the neck fluid. In that one the nub looks like it may be ever so slightly angled up. My tech did guess 70% girl based on everything she saw, but also said nubs are notoriously unreliable at guessing gender because too many things affect its positioning and most nubs are somewhere in between the perfect ranges for each. I've seen so many gender opposites browsing photo galleries and tons in the boy galleries that looked like they could be girls and vice versa. I'm really not sure what to think of nubs for gender anymore. LOL