4d ultrasounds?

Tiffany
I've had them done before with my previous pregnancies, but I checked their site the other day and it's different. They are now offering a 2d scan as early as 15 weeks for gender determination! Is this actually possible? Has anyone had a gender scan done this early? I would LOVE to do it, but I don't want to waste my money if there's a big chance it'll be inaccurate. TIA!