Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand..
As per your complain sore and swollen circumvallate papillae can occur due to a number of reasons like
throat infection, allergies, oral infections,
acid reflux, burning with hot foods and chemicals like concentrated mouthwash solution..
Nothing to worry as it commonly does not indicate and serious illness..
You can do warm saline gargles, take
Acetaminophen for pain as it is considered safe during
pregnancy,do cool water rinses and drink plenty of water..
Avoid hot and spicy food and take a
soft diet..
In case if it still does not improve consult an Oral Physician and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.