Thank you for your pregnancy
What you describe sounds like angioedema
This is a type of allergy
where the lips swell up, they go red and there is stinging and itching sensation.
Allergies of all types are common in pregnancy, however what you describe is not pregnancy specific.
You should not take it lightly, because in severe cases, the throat , tongue etc might swell similarly, leading to breathing difficulties.
Consult your obstetrician at the earliest and have a specific diagnosis and treatment for the condition.