Sprite Doesnt show up

My "Bug" sprite doesnt work all the health and stats decrease/increase properly that is for sure

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class SpriteChanger : MonoBehaviour {
     public Sprite AlienEgg;
     public Sprite HumanEgg;
     public Sprite BugEgg;
     public Sprite ChickenEgg;
     public Sprite DogEgg;
     public Sprite Bug;
     public static SpriteRenderer spriteRenderer;
     public static int EggBought = 0;
     public Text Health;
 
     // Use this for initialization
     void Start () {
         spriteRenderer = GetComponent<SpriteRenderer>();
 
 
     }
     void Update (){                
             
         if (EggBought == 1) {
             spriteRenderer.sprite = BugEgg;
         } 
         else if (EggBought == 2) {
             spriteRenderer.sprite = DogEgg;
         }
         else if (EggBought == 3) {
             spriteRenderer.sprite = ChickenEgg;
         }
         else if (EggBought == 4) {
             spriteRenderer.sprite = HumanEgg;
         }
         else if (EggBought == 5){
             spriteRenderer.sprite = AlienEgg;
         }
 
         Health.text = ("") + Health;
         }
 
     // Update is called once per frame
     void OnMouseDown () {
         
         if (EggBought == 1) {
             if (Storage.health >= 0) {
                 Storage.health -= 1;
                 Debug.Log (Storage.health);
                 if (Storage.health == 0) {
                     spriteRenderer.sprite = Bug;
                     Storage.money += 50;
                 }
             }
         }
     }
 }