A Shamrock does NOT have four leaves, and isn't about luck.
The phrase "the luck of the Irish" may have confused you. You can wear a lucky clover if you wish. But it isn't a shamrock.
Most especially - Please don't tell me it doesn't matter/it's the same thing. It is the symbol of my people, and it has THREE leaves. People died for the right to wear it.
You would not, for instance, stick an oak leaf (powerful and lovely an image as it is) on the Canadian flag -- because That's Not Where It Goes.
Thanks for listening.