Four of a Kind with Aces - The Nuts

I have not been playing too much this week, i traded playing game with learning the game for a couple of hours this week.
Anyway i played some SNG's and very few hands on cash games, in one of those hands at FLH50, i hit the nuts with a four of kind of aces.
On preflop i am holding AJo and i make a bet.
On the flop i hit three of a kind and raise the opponent bet.
On the Turn another Ace comes and everybody checks to me (i have position) and i also check.
On the River one opponent bet and i make a raise.