It is important to consult with your healthcare provider before using any medication, including Duolin Nebulizer, during pregnancy. While there may be limited studies on the safety of this specific medication in pregnant women, your doctor can assess the potential risks and benefits based on your individual circumstances. They may recommend alternative treatments or adjust the dosage if necessary. It is crucial to manage bronchitis effectively during pregnancy to prevent complications, so make sure to communicate openly with your healthcare provider about your symptoms and concerns.