no milk

Erin
My baby is 5 days old and my milk still isn't in. I'm getting worried there is an issue. My pediatrician had me supplement two days ago because he hadn't had wet diapers. Today he has had the right amount of wet diapers without supplementing but is fussy when feeding so I'm wondering if he's getting enough. 
How long before my milk comes in? Is it normal to take this long? I'm calling the lactation consultant tomorrow.