Given your previous C-section was only 16 months ago, a scheduled repeat C-section is generally the safest option. The short time frame between pregnancies increases the risk of uterine rupture during a vaginal birth, and a planned delivery helps safely manage your blood pressure. For blood pressure control during delivery, medications like labetalol or nifedipine are safe and commonly used. For your thyroid disorder, continuing levothyroxine is safe and essential. Your conditions are highly manageable, so please consult your obstetrician soon to finalize a safe delivery plan for you and your baby.