Hello, my two and a half month old daughter is coughing in the morning…

Hello, my two and a half month old daughter is coughing in the morning only and has a stuffy nose, although I even use an aspirator to clean it out, there's nothing there. I don't understand what to do. The pediatrician says everything is fine, we humidify our home, can anyone tell me what to do? And also, should we get her vaccinated soon, is this dangerous in such a situation?