Game Object is moving towards the left when fire button is pressed.

I'm currently making a Space Invader clone as a practice I used Rigidbody on the ship. The problem that I'm getting is whenever I pressed the fire button the Ship moves towards the left every time it shoots. Choosing Kinematic fixes this, however this ignores the box collider that I placed on to act as a border for the ship.

I know that there are better ways to execute this properly but I'm currently experimenting if there is a way to remove the force.

My question is how can I remove the force being added to the ship?

Code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 [RequireComponent(typeof(Rigidbody2D))]
 public class ship_control : MonoBehaviour
 {
     public float moveSpeed;
     private Rigidbody2D ship;
 
     public GameObject shot;
     public Transform shotSpawn;
     public float fireRate;
 
     private float nextFire;
 
     // Start is called before the first frame update
     void Start()
     {
  
         ship = GetComponent<Rigidbody2D>();
         
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetAxisRaw("Horizontal")>0.5f||Input.GetAxisRaw("Horizontal")<-0.5)
         {
             ship.velocity = new Vector2 (Input.GetAxisRaw("Horizontal") * moveSpeed, ship.velocity.y);
         }
 
         if (Input.GetAxisRaw("Horizontal")<0.5f&&Input.GetAxisRaw("Horizontal")>-0.5)
         {
             ship.velocity = new Vector2(0f, ship.velocity.y);
         }
 
         if (Input.GetButton("Fire1")&&Time.time>nextFire)
         {
            
             nextFire = Time.time + fireRate;
             Instantiate(shot,shotSpawn.position,shotSpawn.rotation);
         }
 
         
 
         
     }
 }