Spawning a number of enemies while condition is true

I've been stuck on this problem for awhile, I'm trying to spawn a certain number of "Enemies" only if the number is equal or below the variable I set. However no matter what I put it only spawns one or none at all. Please help if you can!

 public GameObject Enemy;
 
      int totalNumberEnemy = 2;
      int numberEnemy;
 
     bool canSpawn;
 
      void Start()
     {
        canSpawn = true;
        StartCoroutine(EnemySpawn());
     }
 
      void FixedUpdate()
     {
         numberEnemy = GameObject.FindGameObjectsWithTag("Enemy").Length;
         print(numberEnemy);
         if (numberEnemy < totalNumberEnemy)
         {
             canSpawn = false;
         }
     }
 
 
   
     IEnumerator EnemySpawn()
     {
         while(canSpawn)
             {
             Instantiate(Enemy, transform.position, Quaternion.identity);
             yield return new WaitForSeconds(2f);
             }
 
     }