AITJ for pranking a girl at prom?

I (18 f) am a senior in high school, and this has been the worst year of my life. My gym teacher can't take a joke. My friends and I were hanging out after class just to hear the freaky jesus girl scream that she was bleeding. She must have never had her period before! So we told her to plug it up. WE got in trouble when she was bleeding all over the goddamn floor. ​​​​​​She banned us from prom!!! As revenge, we decided to pour blood all over that jesus girl while she was on stage!​ she went wacko and now i and all my friends are riding the escalator to hell. AITJ?!