help, I leaked

Its currently 4am - I’m living in a room with 3 other children. 16, 14,13 the two guys are youngest and oldest and I’m 17. I bleed through my pants and underwear (which have been changed) the sheets and mattress have been bleed through. I’m on the top floor and my parents are downstairs what do I do?? The c sheets are my family’s and they are chill with overbleeding but what will I do with the mattress owned by the holiday place??