Help? I tried to be cool and...?

Hello,i was pretty drunk at my house one night, and i got naked and i tied to impress my mates by showing them a magic trick i learnt from the internet where you take a beer bottle, balance it on your head and flip it up, not letting it smash. Anyway, it smashed and piece of glass entered my japse and cut it a bit. i thought it was nothing at first but then, during sex with my girlfriend, the scab came off and i though she was bleeding so i called an ambulance,?