It is not uncommon to experience symptoms such as slight phlegm, a sore throat, and lightheadedness during pregnancy. Hormonal changes can affect your immune system, making you more susceptible to respiratory infections. Additionally, increased blood flow and pressure on the blood vessels can cause dizziness or lightheadedness. However, if you are concerned about your symptoms or they worsen over time, it is always best to consult with your healthcare provider for further evaluation and guidance. They will be able to assess your specific situation and provide appropriate advice or treatment if needed. In the meantime, make sure to stay hydrated, get plenty of rest, and consider using saline nasal sprays or gargling warm saltwater to alleviate any discomfort in your throat.