Can you describe, please?
I wasn't planning on finding out and really wanted the surprise but we're having a huge problem with this pregnancy and constant scanning and I think I accidentally saw something 'genital' today.
I was quite surprised it looked like it did, not what I was expecting, but still I was quite convinced I knew what I was looking at - I've seen a lot of babies' front bum areas of both kinds! Asked DH when we got home and he said he thought the same as me. 
I don't want to say what I thought, I want you to tell me what you saw and what gender you were told so I can work out if I'm right or wrong or so I can get a grip of myself because I'm clearly not a trained eye and how the hell should I know?!