Making a shotgun shooting 45 degrees to the left of the mouse

I am making a 2D top-down shooter and attempting to make a shotgun-like weapon, I currently have a piece of the script that shoots towards the mouse and I had it instantiate two other bullets alongside of that that rotates 45 degrees but it still keeps moving along the same axes. This is the script I have that's supposed to use the Shotgun mechanic

     public void Shotgun ()
     {
         GameObject bb = Instantiate(player.bullet, player.bulletSpawn.transform.position, Quaternion.identity);
         bb.GetComponent<Rigidbody2D>().AddForce((player.mousePos - transform.position) * player.bulletSpeed);
         GameObject bb2 = Instantiate(player.bullet, player.bulletSpawn2.transform.position, Quaternion.identity);
         bb2.GetComponent<Rigidbody2D>().AddForce((new Vector3(player.mousePos.x, player.mousePos.y, player.mousePos.z + 45) - transform.position) * player.bulletSpeed);
         GameObject bb3 = Instantiate(player.bullet, player.bulletSpawn3.transform.position, Quaternion.identity);
         bb3.GetComponent<Rigidbody2D>().AddForce((new Vector3 (player.mousePos.x, player.mousePos.y, player.mousePos.z - 45) - transform.position) * player.bulletSpeed);
     }

The parts of the "player" variable it's refering to is a reference to my player script which looks like this:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Player : MonoBehaviour {
 
     public Animator anim;
     public float moveSpeed;
     public GameObject bullet;
     public GameObject bulletSpawn;
     public GameObject bulletSpawn2;
     public GameObject bulletSpawn3;
     public float bulletSpeed;
     public float stamina;
     public bool hasEnoughStamina;
     //[HideInInspector] public Vector2 lookDirection;
     [HideInInspector] public Vector3 mousePos;
     private float sprintSpeed;
     private PlayerAbilities pa;
 
     private void Start()
     {
         pa = gameObject.GetComponent<PlayerAbilities>();
         sprintSpeed = moveSpeed *= 1.5f;
     }
 
     void Update () 
     {
         if(!hasEnoughStamina)
         {
             moveSpeed = 0.1f;
             stamina += Time.deltaTime;
             if (stamina >= 10)
                 hasEnoughStamina = true;
         }
 
         mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
         transform.rotation = Quaternion.LookRotation(Vector3.forward, mousePos - transform.position);
 
         if (Input.GetKey(KeyCode.A))
         {
             transform.Translate(Vector3.left * moveSpeed, Space.World);
         }
 
         if (Input.GetKey(KeyCode.D))
         {
             transform.Translate(Vector3.right * moveSpeed, Space.World);
         }
 
         if (Input.GetKey(KeyCode.W))
         {
             transform.Translate(Vector3.up * moveSpeed, Space.World);
         }
         
         if (Input.GetKey(KeyCode.S))
         {
             transform.Translate(Vector3.down * moveSpeed, Space.World);
         }
 
         if(Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.D))
         {
             anim.SetBool("IsMoving", true);
         }
 
         if (!Input.GetKey(KeyCode.A) && !Input.GetKey(KeyCode.W) && !Input.GetKey(KeyCode.S) && !Input.GetKey(KeyCode.D))
         {
             anim.SetBool("IsMoving", false);
         }
 
         if(Input.GetKeyDown(KeyCode.Mouse0))
         {
             pa.Rifle();
         }
 
         if(Input.GetKeyDown(KeyCode.Mouse1))
         {
             pa.Shotgun();
         }
 
         if(Input.GetKey(KeyCode.LeftShift))
         {
             if (hasEnoughStamina)
             {
                 moveSpeed = sprintSpeed;
                 stamina -= Time.deltaTime;
                 if (stamina <= 0)
                     hasEnoughStamina = false;
             }
         }
 
         if(Input.GetKeyUp(KeyCode.LeftShift))
         {
             moveSpeed = 0.1f;
         }
     }
 }

If you need any images at all or any other information to help answering, I would be more than happy to give it to you. Thank you for reading this, any advice or help would be wonderful!