delay first spawn

When I play the enemys spawn instantly from each spawnpoint then go to there normal delay time and i need a way to get rid of the first enemy spawned maybe a delay or a way to delete it.

Thankyou

var Enemy : GameObject;
var DelayMin = 5.0;
var DelayMax = 20.0;

    function Start () {
        SpawnRoutine();
}

    function SpawnRoutine () {
        while(true) {
        Instantiate (Enemy, transform.position, transform.rotation);
        yield WaitForSeconds(Random.Range(DelayMin, DelayMax)); 
    }
}