Line on watch
There is a highlighted blue vertical line on my watch that just appeared.
Apple Watch
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That could be the beginning of a bad display. I would schedule an appt with the Genius Bar and have it looked at it it is still under warranty.
ASC - Late 2012 Mac mini, macOS 10.15.2; Watch, series 5 GPS/cellular, watchOS 6.1.1; iPad Air 2, ipadOS 13.3; iPhone 8+, iOS 13.3; TV 4th Gen, tvOS 12.4.1; HomePods, audioOS 13.3 and Airport Express w/ Airplay 2