Period at school

Urgh today I had the worst day. At school I was in my social studies class and at the end I get up. My friend tells me there is something red on my chair. And I was like what no. So I quickly put up my chair and leave with my best friends and tell them. I’m scared to go to school tomorrow. Because I didn’t wipe the seat. What should I do? And what will I do when I go to social studies tomorrow?