. Im saying that at a very young (like right after conception) the private parts look like female, in both male and female, but then around 6-8 weeks the private parts extend out and look like a penis in both male and female. This is why after 12 weeks you can do the nub theory. At that point, the female genitalia is starting to go back to it's original labiel looking state. In the male the penis looking structure becomes even more defined to be a penis. If it's a boy obviously that isn't disappearing lol but if it's a girl and it hasnt gone back to the labiel looking state completely yet, it can be mistaken for a boy if it's before it is totally rescinded. I hope im making sense here. So what im saying is, no a true penis would not disapear, but if you were looking at a female, but too early, it can look like a penis when it isn't. So if you have a boy thats fab!!! But you found out so early the first time around theres always that chance for misinterpretation. 
I asked for a potty shot at the early scan bit she said she didnt save it so didnt give me one which i was miffed at really! I had a gender scan with my 2ndson at 16 weeks and i agree you cannot mistake a willy lol x
you poor thing. Thats horrible wht you have to go through to find out the sex, especially when you've dealt with GD I cant imagine how hard it is for you to be tossed around this and dealing with GD. i hope this next scan is as clear as day, no questions asked 
Im so excited for you!
