Morning sickness with #2

I'm having my second baby, and it's like clockwork every morning. Wake up, take prenatal vitamin, and the throw up said vitamin! 
My first child is a little boy, and I was never sick with him, I was perfectly content and healthy and felt great. 
With this one, I'm tired, crampy, and constantly nauseous. Is this a sign it could be a little girl? That's what I'm hearing. 
Any thoughts?