How do I make it so the sword does not duplicate?

I made a script so if you touch a part you get a sword. I made it so you'll only get one sword. However, if you equip the sword it would give you an extra sword. How would I fix this? Here is the script:

script.Parent.Touched:Connect(function(hit)
	local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
	local sword = game.ReplicatedStorage.Sword:Clone()
	-- Detects if the part that 'hit' the brick contains a Humanoid
	wait()
	if plr.Backpack:FindFirstChild("Sword") then
	else
		if hit.Parent.Humanoid then
		-- Function GetPlayerFromCharacter returns the Character associated with the player (hit.Parent)
		-- Clones tool into player's backpack
		sword.Parent = plr.Backpack
	end

end
end)

check if the player already has the sword with

local player = game.Players.LocalPlayer
local hasSword = false

for _,v in pairs (player.Character:GetChildren()) do
	if v.Name ~= "Sword" then 
		hasSword = true
	end
end
for _,v in pairs (player.Backpack:GetChildren()) do
	if v.Name ~= "Sword" then 
		hasSword = true
	end
end

if hasSword then
	local sword = game.ReplicatedStorage.Sword:Clone()
	sword.Parent = player.Backpack
end

The reason you gotta check the player's backpack and character is that if the item is equipped it's parent is the character if it's not it's in the backpack.

local deb = false

script.Parent.Touched:Connect(function(hit)
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    local sword = game.ReplicatedStorage.Sword:Clone()
    local human = hit.Parent:FindFirstChild("Humanoid")
    -- Detects if the part that 'hit' the brick contains a Humanoid
    if human then
	   if plr.Backpack:FindFirstChild("Sword") then
	else
			if not deb then
				deb = true
				sword.Parent = plr.Backpack
				wait(2)
				deb = false
		end
    end
    end
end)

i just copied and pasted your work here and edited it. (i also added a debounce)