Reload clip in update with courutine

Hello

I have a input get key down in a if statement in the update method.

when I press the R key and my bullet count equals to zero it fires a courutine and I can reload.
This works exactly as expected .

now I try to do this automatically without pressing the R key so in my update function I have an if statement if bullet count is zero then do exactly as before, but I think do to the nature of update every frame this does not work.
It does it several time. How can I execute same setup in the update ? I tried fixed update with same result.
I think I maybe need a bool to check for once??

 

Either store the return value of StartCoroutine and use that to keep track, or yeah, use an isReloading boolean.