OnTriggerEnter to load new level

Hi, I'm making a game where the player collects fruit, and must collect a certain amount to proceed to the next level. I have a cube at the moment as the end of level, where i'm trying to make it as a trigger to go to the next level if the player has 3 points, and go to a game over/retry scene if the have under 3. I have set the cube collider as a trigger, and this is my code:

 var Counter : int = 0;
 var fruit : int = 3;
 
  
 function Update () {
  guiText.text = "Score is: "+Counter;
  
 } 
 function OnTriggerEnter(col : Collider){
     if(col.gameObject.tag == "end")
     if (gameObject.name == "Player")
        if (Counter == 3)
           Application.LoadLevel("level2");
           
        else if(col.gameObject.tag == "end")
             if (gameObject.name == "Player")
             Application.LoadLevel("gameover");
 }

Nothing seems to be happening when passing through the exit cube, which is tagged as "end".

If anyone could help that would be great! Thanks in advance.