When we had our recent 20 week scan, there is no doubt that there is a penis and scrotum there, and with our young lady, the three lines. they where just so obvious, and so different .
That's the thing, I've seen other peoples pics and they are really obvious. Ours, not so much - when I look closely sometimes I think I can see bits of both. have a look and see what you think

Pictures by misseviegirl - Photobucket