Charging Enemy behaviour?

So basically I'm trying to make an enemy that chargers at you and it if detects a change in your x direction he's supposed to pause and recalculate the direction you're in and charge that way instead.

here's my code:

 using UnityEngine;
 using System.Collections;
 
 public class ChargingEnemyAI : MonoBehaviour {
 
     public GameObject Player;
     public float Velocity = 0;
     
     public Vector3 movement;
     bool isCharging = false;
     bool ischargeLeft = false;
     bool ischargeRight = false;
     // Use this for initialization
     void Start () {
     
     }
     
 
 
     // Update is called once per frame
     void Update () {
 
         Charge();
 
 
 
     }
 
     public void Charge()
     {
        if(isCharging == false)
         {
             if(Velocity >= 1)
             {
                Velocity -= 1;
             }
             else
             {
                 Velocity = 0;
             }
 
 
             Invoke("CalculateDirection",2);
         }
         else
         {
             if (ischargeLeft)
             {
                 if (Player.transform.position.x > this.transform.position.x || Player.transform.position.x == this.transform.position.x)
                 {
                     isCharging = false;
                 }
                 else
                 {
                     Velocity += 1;
                     movement.x = -0.5f * Velocity;
                     movement.y = this.transform.position.y;
                     movement.z = this.transform.position.z;
                     this.transform.position = movement;
                 }
 
            
             }
 
             else if (ischargeRight)
             {
                 if (Player.transform.position.x < this.transform.position.x || Player.transform.position.x == this.transform.position.x)
                 {
                     isCharging = false;
                 }
                 else
                 { 
                     Velocity += 1;
                     movement.x = 0.5f * Velocity;
                     movement.y = this.transform.position.y;
                     movement.z = this.transform.position.z;
                     this.transform.position = movement;
                 }
 
             }
 
         }
 
 
     }
 
     public void CalculateDirection()
     {
         if (Player.transform.position.x < this.transform.position.x)
         {
             ischargeLeft = true;
             ischargeRight = false;
             isCharging = true;
         }
         else if (Player.transform.position.x > this.transform.position.x)
         {
 
             ischargeRight = true;
             ischargeLeft = false;
             isCharging = true;
         }
 
     }
 
 }

Using this, the enemy seems to go towards my player and then start flickering left and right. Can anyone tell me what's wrong with my code?