no, it's just a little one at the top of the screen, but it's supposed to make a sound so that it's harder to miss

Oh..
Or if it gets to 8 seconds, it shows it big on your screen?

Was whispering to other players and didnt even realize it

there is one, maybe you have your game muted? click the gears in the bottom right and see if you have the "mute" box checked.