OntTriggerEnter2D keeps detecting other ones

Hello, I'm trying to make a little game, in which you should be able to roam in space for ever. 1 background sprite has a trigger collider which instantiates 8 background sprites in each direction. The problem is that one background tile keeps detecting an other on the same spot. I tried fixing this with a Physics2D.OverlapBox, but this doesnt work. This is my code; using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class background : MonoBehaviour
 {
     public GameObject bg;
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         
     }
     private void OnTriggerEnter2D(Collider2D collision)
     {
         if (Physics2D.OverlapBox(new Vector3(transform.position.x - 30, transform.position.y - 30, 0),new Vector2(30,30),0)) {
                 // 0 x 0
         }
         else
         { Instantiate(bg, new Vector3(transform.position.x - 30, transform.position.y - 30, 0), Quaternion.identity);
 
         }
         if (Physics2D.OverlapBox(new Vector3(transform.position.x, transform.position.y - 30, 0), new Vector2(30, 30),0))
         {
                     // 0 X 0
         }
         else
         {Instantiate(bg, new Vector3(transform.position.x, transform.position.y - 30, 0), Quaternion.identity); 
 
         }
         if (Physics2D.OverlapBox(new Vector3(transform.position.x + 30, transform.position.y - 30, 0), new Vector2(30, 30),0))
         {
         }
         else
         {
             Instantiate(bg, new Vector3(transform.position.x + 30, transform.position.y - 30, 0), Quaternion.identity);
 
         }// 0 0 0
 
         if (Physics2D.OverlapBox(new Vector3(transform.position.x - 30, transform.position.y, 0), new Vector2(30, 30),0))
         {
            
         }
         else
         {
  Instantiate(bg, new Vector3(transform.position.x - 30, transform.position.y, 0), Quaternion.identity);
         }
         if (Physics2D.OverlapBox(new Vector3(transform.position.x - 30, transform.position.y + 30, 0), new Vector2(30, 30),0))
         {
             
         }
         else
         {Instantiate(bg, new Vector3(transform.position.x - 30, transform.position.y + 30, 0), Quaternion.identity);
 
         }
         if (Physics2D.OverlapBox(new Vector3(transform.position.x + 30, transform.position.y, 0), new Vector2(30, 30),0))
         {
            
         }
         else
         {
  Instantiate(bg, new Vector3(transform.position.x + 30, transform.position.y, 0), Quaternion.identity);
         }
         if (Physics2D.OverlapBox(new Vector3(transform.position.x + 30, transform.position.y + 30, 0), new Vector2(30, 30),0))
         {
            
         }
         else
         { Instantiate(bg, new Vector3(transform.position.x + 30, transform.position.y + 30, 0), Quaternion.identity);
 
         }
         if (Physics2D.OverlapBox(new Vector3(transform.position.x, transform.position.y + 30, 0), new Vector2(30, 30),0))
         {
 
         }
         else
         {
             Instantiate(bg, new Vector3(transform.position.x, transform.position.y + 30, 0), Quaternion.identity);            
         }
 
 
 
 
     }
 }
 

Someone please help me!