gender spotting at 15 weeks -- what's best method?

Isn't it too early for a potty shot? Or not? Is nub a better indication? I have an amnio then and would like to take a peek! Baby was measuring a week ahead, so maybe by then potty shot will work? I am going to get cell free DNA gender results back, but would like to confirm with some real anatomy!!

Thanks!

Potty shot

I'd look for a potty shot at 15 weeks.

I was almost 14 weeks and the tech (who I think wanted to know as bad as i did but my dr's office does not predict gender that early), the very last thing did a potty shot and said Yep! in a very excited way LOL so I think 15 weeks is old enough.

I prefer to have both angles in the 15th week. Potty shots are usually clear by then but I've seen a few ambiguous ones where a nub/side shot would have been handy.