That’s just another stupid and baseless superstition people need to unlearn. I don’t believe my luck will change if I see a black cat in my dream. I try to avoid having superstitions. There is zero evidence that they have a basis in fact, except to the extent that if you believe things are going to go well or badly on a particular day, you are quite capable of turning that into a self-fulfilling prophecy. Psychologically it’s much healthier to set yourself the goal of putting in the best effort you can on whatever you do, but accepting that sometimes things outside your control will determine the outcome.
But human brains are designed to overfit patterns and seek meaning where there is none, and it’s hard to shake superstitions entirely.