Airplane mode is off on my watch but it still has red symbol on top?? What do I do??

I agree, that little red dot means you have notifications, however, you can check if you are in airplane mode if you hold at the bottom and swipe up.

Swipe down from the top and check for notifications. See if that clears the red dot.

Notifications on your Apple Watch - Apple Support

Edit: more info > Status icons and symbols on Apple Watch - Apple Support