Hi.
Throat will be painful because of Infection of tonsil and associated inflammation which has spread to surrounding areas.
Response to Antibiotics and anti inflammatory drugs in
Tonsillitis depends on its severity.Higher antibiotic with broad spectrum of action can be useful,but to be used cautiously in
pregnancy.
Though you are pregnant,you can go for
Tonsillectomy surgery ,if the symptoms are severe.
Please consult your ENT surgeon and take decision.