Can I be fired for calling in sick when I tried getting the day off. Or can I be asked for a sick note if I only called in for one day

This would depend on whether you are actually sick. That said, it is unlikely you could be terminated with cause for missing one day of work. If terminated, I would encourage you to call us right away. I would also encourage you to visit the severance pay calculator our firm has developed to see what you would be owed it terminated (www.SeverancePayCalculator.com).