Yes, it's possible. At day 12, you should probably see your doctor.
You could also have a sinus infection or another upper respiratory infection that needs an antibiotic.
Oh - I just noticed the date on your post. By now, you're either better or have gone to the doctor. I hope you're feeling better. :)
If you have bronchitis, you should drink plenty of water, Try 10 to 15 cups a day to help thin out the mucus.