If you're on thyroid hormone replacement -- like levothyroxine (Synthroid) or Armour Thyroid -- and become pregnant, will you need a dosage change in your medication? Which women should absolutely be screened for thyroid problems before, during and after pregnancy? What should you know about thyroid problems after pregnancy. These issues, and many more, are covered in newly published clinical guidelines for the management of thyroid problems in pregnancy, the postpartum period, and in newborns. This is critical information you need if you develop thyroid disease during or after pregnancy, or you have a diagnosed thyroid condition prior to becoming pregnant.