Pneumonia: This is a common condition that can cause hemoptysis and cough in pregnant women. Pregnancy increases the risk of respiratory infections due to immunological changes and increased pressure on the diaphragm, which can lead to reduced lung capacity.

Asthma: Exacerbation of asthma can occur during pregnancy due to hormonal changes, leading to cough and potentially hemoptysis if severe.
Chronic Bronchitis: Similar to asthma, chronic bronchitis can worsen during pregnancy, causing cough and potentially hemoptysis.
Pulmonary Embolism (PE): Although more commonly associated with postpartum, PE can occur during pregnancy, especially in the third trimester, and can cause cough and hemoptysis.
Tuberculosis (TB): Reactivation or new infection of TB can occur during pregnancy, leading to symptoms of cough and hemoptysis.

Pulmonary Vasculitis (e.g., Wegener's Granulomatosis): These conditions are rare but can be life-threatening and require immediate treatment. They can cause hemoptysis and cough among other symptoms.
Lung Cancer: Although rare in younger populations, lung cancer can occur and must be considered, especially if risk factors are present.
Aortic Dissection: A life-threatening condition that can cause hemoptysis if the dissection involves the aorta near the lung roots.
Amniotic Fluid Embolism (AFE): A rare but highly lethal condition that can occur during pregnancy, causing sudden onset of symptoms including cough and potentially hemoptysis.

Goodpasture Syndrome: A rare autoimmune disease that can cause hemoptysis and renal failure.
Pulmonary Arteriovenous Malformations (PAVMs): Can cause hemoptysis due to abnormal connections between pulmonary arteries and veins.
Mitral Stenosis: Can lead to pulmonary congestion and potentially hemoptysis, especially if there is associated pulmonary hypertension.
Lymphangioleiomyomatosis (LAM): A rare lung disease that can cause hemoptysis, more commonly seen in women of childbearing age.