The luck in gamble shows only when the person starts gambling and not before that. Even so it is not possible for anyone to foresee when their luck will come to them. Luck simply comes and goes, it is momentary and hence not permanent. That is why gambling more only leads to losses because you may not be lucky every time and each time you play the odds are against you and the house edge draws money away from you.
If you want to see if you are lucky or not, not only from gambling. See if you are lucky enough in your real life or not. If you are lucky in your real life then you are lucky although you keep losing gambling. I am the guy that will never win in the long term or short term so no matter what for me itis not profitable
Luck in any field does not guarantee luck in gambling as well. In fact its dangerous to assume such a thing because gambling is associated with big amounts of money and you are potentially risking that by saying such. Hence we must no assume our luck to prevail and thus focus on things in life which need lesser luck and more hard work from our part.