Yes, it is normal. It will show sex when it is ready, not one minute before. Someone has already posted that it can take 2 weeks or more. Some strains take even longer than that. Learn some patience. Plants are not going to change how they grow just because you want to see it happen now. I know that is true, because when I first started growning, I would nearly give myself a stroke worrying about this kind of stuff. Since I have been growing a steady supply though, I have been too damn high to worry about much of anything! Hang in there.