I dont believe in good luck streaks, although they sometimes happen of course, but that is out of pure probability that they shall happen once in a while.
But I do believe in BAD luck streaks that, once started, will persist at least till the end of the day if not longer. Its not that I BELIEVE to those, rather, it is my observation that such days hit me and more often than I would like, where I suffer bad beats with 18%, 11% and alike probability to lose, and I still lose far more than if it actually took place 18%, 11% of a time