when can i tell if its a girl

As early as 16 weeks :)

Depends on what state you live in though, in California you find out between 18-20 weeks at the doctor unless you schedule an ultrasound at a place that specifically does ultrasounds for gender (there are tons) and if your baby does not turn out to be what they tell you, you get a 100% money back guarantee. These places do it as early as 16 weeks, that's when baby's genitalia appear outside :)) You can check into one they are cheap and give you either 2d or 3d/4d pics. Video of baby if you want, colored/blk and wht photos :))

It just depends on what you want :))