It sounds like you're trying to say that due to the fog, you haven't yet reached your school. Here's a clearer way to phrase it:

"Because of the fog, we haven't reached our school yet."

If you'd like to rephrase it differently, here are a few options:

1. "The fog has delayed our arrival at school."
2. "Due to the fog, we're still on our way to school."
3. "We're running late for school because of the fog."
4. "The fog prevented us from reaching school on time."

Let me know if you need any more variations or if there's anything else I can help with!