If you are experiencing a persistent cough during certain movements such as lying down or getting up, it is important to consider the trimester of your pregnancy, any associated symptoms, and the duration of the cough. It is possible that the position of the baby could be causing compression on your diaphragm, leading to difficulty breathing or coughing. Other potential causes of coughing during pregnancy include asthma, viruses, throat irritation, gastric reflux, or other conditions. It is advisable to consult with a healthcare professional to determine the best course of action for managing your symptoms.