double jump not working when off fall off the edge

Below is my script. I am making a 2D platform running game. My player is able to do double jump. However, when I fall off the edge of the platform i can only do 1 jump.

My script is only saying to double jump when I am grounded. I want to be able to do double when I am grounded and when i am not.

Thankyou

     // Use this for initialization
     void Awake()
     {
         myRigidbody = GetComponent<Rigidbody2D>();
         myCollider = GetComponent<CircleCollider2D>();
         theScoreManager = FindObjectOfType<ScoreManager>();
         speedMilestoneCount = speedIncreaseMilestone;
 
         moveSpeedStore = moveSpeed;
         speedMilestoneCountStore = speedMilestoneCount;
         speedIncreaseMilestoneStore = speedIncreaseMilestone;
 
         jumpTimeCounter = jumpTime;
 
         stoppedJumping = true;
     }
 
     // Update is called once per frame
     void Update()
     {
         grounded = Physics2D.IsTouchingLayers(myCollider, whatIsGround);
 
         myRigidbody.velocity = new Vector2(moveSpeed, myRigidbody.velocity.y);
         if (Input.GetMouseButtonDown(0))
         {
             if (grounded)
             {
                 myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, jumpForce);
                 stoppedJumping = false;
             }
             else if (!grounded && canDoubleJump)
             {
                 myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, jumpForce);
                 jumpTimeCounter = jumpTime;
                 stoppedJumping = false;
                 canDoubleJump = false;
             }
         }
     }
 
     public void FixedUpdate()
     {
         if ((Input.GetMouseButton(0)) && !stoppedJumping)
         {
 
             if (jumpTimeCounter > 0)
             {
                 myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, jumpForce);
                 jumpTimeCounter -= Time.deltaTime;
             }
         }
 
         if (Input.GetMouseButtonUp(0))
         {
             jumpTimeCounter = 0;
             stoppedJumping = true;
         }
 
         if (grounded)
         {
             jumpTimeCounter = jumpTime;
             canDoubleJump = true;
         }
     }
 }