You are answering a USMLE-style medical question. Question: A 35-year-old woman presents to her primary care provider concerned that she may be pregnant. She has a history of regular menstruation every 4 weeks that lasts about 4 days with mild to moderate bleeding, but she missed her last period 2 weeks ago. A home pregnancy test was positive. She has a 6-year history of hyperthyroidism that is well-controlled with daily methimazole. She is currently asymptomatic and has no complaints or concerns. A blood specimen is taken and confirms the diagnosis. Additionally, her thyroid-stimulating hormone (TSH) is 2.0 μU/mL. Which of the following is the next best step in the management of this patient? Options: A) Continue methimazole B) Discontinue methimazole, start propylthiouracil C) Add glucocorticoids D) Refer for radioiodine therapy Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.