I had a boy turn into a girl around the 13-15 week mark. If you click on my screename, you can find the original posts about it. There are pictures in those posts too. I haven't seen your pictures and I don't want to scare you, but it happened to me (much to my delight because I really wanted a girl). Now that I have my girl, i am laughing because she is so much harder than my boy!!! Of course I wouldnt' trade her for the world, but, my gosh she is a HANDFULL!!!!!!!!!
Good luck!
Shannon