You’re right to be concerned about a fever of 104.9°F. Generally, a fever that high can be a sign of serious illness, and it’s important to take it seriously. Most health guidelines recommend staying home if you have a fever, especially one that high. It’s important to prioritize your health and the health of others, as high fevers can be contagious and may indicate an underlying infection.
You should definitely talk to a parent or guardian about how you’re feeling. They may want to discuss the situation with your school to clarify their policies. It's always better to err on the side of caution when it comes to your health.