Problem: A 32-year-old woman is seen in follow-up to her weight loss and amenorrhea. Labwork from 6 weeks ago showed a thyroid-stimulating hormone (TSH) level of 0.3 microU/mL and a free thyroxine (T4) level of 4.2 ng/dL. She was prescribed methimazole and is tolerating it well. She reports the return of her menstrual periods and wanted to discuss family planning during today's visit. Which of the following is the most appropriate recommendation for this patient? Need Assignment Help service?
A. Continue methimazole for all three trimesters of pregnancy B. Stop methimazole, and continue with propylthiouracil (PTU) for all three trimesters of pregnancy C. Start propylthiouracil for the first trimester, then switch to methimazole for the second and third trimester D. Continue methimazole for the first trimester, then switch to propylthiouracil (PTU) for the second and third trimester