The order of the sound played

Hi, I am trying to make sound only play when the popup comes up (the popup saying that you answered wrong and a buzzing wrong sound)

I think I put it before the popup. But, still the sound plays only after the popup gone away.

Can anyone show me What I did wrong here ?

Heres the code :

     public void CheckAnswer()
     {
         string userAnswer;
         userAnswer = inputField.text.ToUpper ();
         if (userAnswer == answer) {
             Debug.Log ("Correct");
             AudioIsPlaying.isPlayingWrongCorrect = 1;
             ++MyScore.score;
             ++MyScore.stage;
             if(MyScore.stage == 6){
                 Application.LoadLevel ("main2"); //Harus ke gameOver Scene
             }else{
                 Application.LoadLevel ("main");
             }
         } else {
             Debug.Log ("Wrong");
             AudioIsPlaying.isPlayingWrongCorrect = 2; //this is the sound, it is playing after the Startcoroutine
             if(MyScore.live == 1){
                 MyScore.score = 0;
                 MyScore.stage = 1;
                 Application.LoadLevel ("GameOver"); 
             } else {
                 txtLives.text = MyScore.live.ToString ();
                 StartCoroutine(WaitPopup(1)); //sound plays after this
 
             }
 
         }
     }
 
     IEnumerator WaitPopup (float duration){
         while (true) {
 
             Debug.Log ("tes1?");
             popupwrong.SetActive (true); // iwant the sound play together with this set true, even when I put the audio before this line. The result still the same
             objTimer.SetActive(false);
             Debug.Log ("tes2");
             yield return new WaitForSeconds (duration);
             Debug.Log ("tes3");
             MyScore.live = MyScore.live - 1;
             popupwrong.SetActive (false);
             Application.LoadLevel ("main"); //sound plays at this point???
 
         }
     }

your help would be very appreciated. Thanks before