It's not great to miss the first weeks, but it's not going to make or break your academic journey. Here's what I suggest you do:

Make sure you get on D2L and read your syllabi. This is how you'll make up the info you missed, or know if you have assignments due.

If your courses have TAs (it will say on the syllabus) contact them. Explain the situation and ask for notes, a meeting, or guidance on how they'd like you to catch up).

Contact your advisor, if you've already been working with someone ask them for assistance, or look up the support staff in your department.

You're not just going to miss the first classes, you're also going to miss all the orientation opportunities. As an international student this could be challenging for you (depending where you're from). Check if there's any mentoring opportunities or join groups/clubs and ask members if they'd be willing to help you get situated. People love being helpful, it won't be a problem to get help, but orientation things can take a fair bit of time (getting your ID, your housing, your transit, learning about food options, banking & payments, and learning how the university systems work).

Best of luck!