A 38-year-old unmarried woman presents with heat intolerance, hyperhidrosis, and weight loss for over 2 months. Physical examination reveals grade I thyroid enlargement without bruits, heart rate 120 bpm with regular rhythm. Thyroid iodine uptake: 3h 36%; 24h 90%. After 1 year of treatment with stable condition, the patient marries and starts oral contraceptive pills (OCPs). Follow-up shows TT<sub>3</sub> 0.05nmol/L (3.2ng/ml), TT<sub>4</sub> 258nmol/L (20.0μg/dl). What should be considered?