How do I know if I have stomach bleeding ?

I'm 14 , 100 pounds , & I took 7 200mg advils (don't ask) before seeing the bottle says "Stomach bleeding warning: This product contains am NSAID, which may cause severe stomach bleeding" Would 7 be enough to cause stomach bleeding & how would I know if I did have stomach bleeding ?
Update: How do I know if I have stomach bleeding ??
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