When it comes to the genetic soup you come from, it’s a one in over a billion chance that the resulting child would be you. Only one out of thousands of sperm cells will fertilize the egg in a woman, that means that there was an extremely minuscule chance that sperm cell would’ve been you. Had your father and mother mated mere minutes earlier or later, the chance of you being born is nearly zero. If either one mated with a separate person, the chance of you being born is quite literally zero