Caught with inside out shirt!!!!! HELP

Taylor
So I was at my bfs house and I came outside when my mom came to drop off money. My shirt was inside out. We all know why my shirt was inside out but I had a freak out. I lied and said I had gym today and pretended to freak out because I walked around school with an inside out shirt. And when I went back inside she texted me  "you better only be taking your shirt off for gym." I made it sound convincing like I didn't studder but I think she knows it's bs and I'm scared to see her again. Can like someone help me not freak out or tell me a story of what happened to them???