Pregnancy rhinitis is not caused by allergies or a cold (though those can also happen). It is caused by the physiological changes of pregnancy:
Nasal Congestion While Pregnant: Causes, Relief, and When to Worry nasal congestion while pregnant
Disclaimer: This review is for informational purposes only and does not constitute medical advice. Always consult your obstetrician or midwife before starting any new treatment during pregnancy. Pregnancy rhinitis is not caused by allergies or