What to do if there is a lot of phlegm in the throat during early pregnancy? | Sharing effective methods to prevent and treat excessive phlegm in the throat during pregnancy: What to do if there is excessive phlegm in the throat during early pregnancy? Sharing effective ways to prevent and treat excessive phlegm in the throat during pregnancy. In the early stages of pregnancy, excessive phlegm in the throat is a common symptom that brings a lot of trouble to pregnant women.