Was this a private scan? Could you afford another scan? I think to put your mind at rest you need to get a picture 100% proof either way, other wise your going to keep questioning for the next 20 weeks. Fair enough surprises are nice, but in this case I think you need answers just so you can put it to rest and love your little one as a special new addition for your family. 5 girls is fun, I have 5, I have taken to calling them 'my precious gems' just so that if the new one is another lady I am in the right mind that she is gonna be as shiny and lovely as the others, not just another girl (I've my fingers x'ed for blue though )