Tulip, can up put the pic up on the net & we can all have a look? You could see clearly that my boys were boys. But this time round the "sonographer" was definate it was a girl. She said, its a girl. I said OMG are you serious? and she said yep definately a girl! I said OMG!
There is a good site that has pic of boy / girl ultrasounds so you can see the differences. Its on the about.com pages in the pregnancy section. Not hard to find.