Your description does match that of an infection, but a doctor would prefer not to comment on the type of infection without a physical examination and laboratory investigations to support the diagnosis. Which is why I request you to schedule an appointment with your doctor at the earliest.
Infections during pregnancy
are quite common, but keeping in mind your sexually active status during your pregnancy as well, we will have to elaborately screen you for all sexually transmitted infections as well. Just to make sure.
Hope this helps.