Personally I wouldn't find out. I'd be too worried that they got it wrong! There's always that tiny chance that it could misread the scan and then there would be a lot of stress when it is not what you thought it would be!
Also I wouldn't be pushing my DH on something like this. It was my DH's job to tell me what it was. It is the one true surprise I reckon And a great reward after all the discomfort and pain!