I also might add that you only have a 5% chance, so don't get your hopes up. It is best to just get on when your life, and if the time comes you may be tested.
Yeah, just keep getting xp and level up, your chance is increased as you level up so you're more likely to be FS if you're a higher leve. getting tested this early is a waste because there is a good chance you're not FS.
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Unless it's changed, if you're FS at creation but not discovered, you're still to get the facets and the like if you're tested at level 20 and finally discovered.