early sign of OCD

So my son is only 2 ! but we have noticed that when he plays with his toys he likes to put them in a line he won't play with them he just organizes them neatly if I clean it up he gets really mad the other day at the doctors he put the kid chairs in a pattern also color wise he put blue yellow red blue yellow red and also in a straight line when he likes up his cars it's in a pattern as well example ; Lego car , regular car Lego car , regular car , like he has to have it a certain way . just curious if it can be a start of ocd or it's just a brain development type of thing