When should you see a doctor if u suspect bronchitis?

3 weeks. When to see a doctor: see your doctor if your cough: lasts more than three weeks, prevents you from sleeping, is accompanied by fever over 100.4 f (38 c), produces discolored mucus, produces blood (hemoptysis), is associated with wheezing or shortness of breath.
For diagnosis... If you have a cough productive of sputum and it is associated with a high fever and/or shortness of breath, a doctor should be seen for diagnosis and treatment. If you have mild symptoms that are improving over time, see a doctor if your symptoms are not completely resolved within 10 days. If your symptoms are worsening, you need to be seen.