Name of Phenomenon? I worry that once I STOP doing an action “just to be safe,” the thing I'm being safe from will occur

I've always had feelings like these before. I've seen sad movies when I was younger, but the thing that got me the most was the kid (who lost their parents) said, "The last thing I ever said to them was I hate you! " Ever since, I would ALWAYS say "I love you" to my parents when they would leave my sight. Whether we went to our work/school or even if I would go upstairs to play games, I would say "I love you." One day, I didn't say it. My dad was leaving to work and I didn't get a chance to say it. I was worried that THIS was the moment where he dies.

With that little backstory, I hope it conveys the feeling I'm trying to describe. I always say "I love you" just in case they would die, the last thing they heard was those words. I have a feeling that once I stop saying it, they will die.

Is there a single word to describe this feeling? This phenomenon?

Another way to look at it in a less morbid setting: You're looking for your headphones. You can't find them. You stop looking. They show up.

Or another example: I have my hand on the tooth under my pillow. I wait for the Tooth Fairy. I stay awake, and she doesn't come. Once I fall asleep, she arrives.

The minute you STOP doing something, that's when the [something] gets answered. Make sense? Is there a word for this?

https://www.psychologytoday.com/us/blog/fulfillment-any-age/201410/why-were-so-superstitious

A superstitious behavior can include rituals you engage in to produce a specific outcome.

We learn superstitious behaviors through a simple reinforcement process. The basic principle behind reinforcement is that when a certain action appears to lead to a desired consequence, we repeat it.

Most behavior we learn through reinforcement involves a reasonably straightforward process linking cause and effect. This is the basis for operant or instrumental conditioning. With superstitious behavior, we perform an extraneous action that happens to accompany the behavior that's truly being reinforced. Now that extraneous action—the superstitious behavior—itself becomes reinforced.

To my mind, this just boils down to Murphy's Law, the belief that bad things happen whenever they can.
This also ties in to one's beliefs of fate, karma and superstition. But from the viewpoint of an objective observer, the theme is coincidence; or perhaps misfortune and bad luck. In adding the poetic backstory, we have a sense of dramatic irony