The standard of care for pregnant addicted women is
Suboxone or Subutex taper, even though maintenance
Suboxone or Subutex is still considered safer than methadone because of much less risk of the respiratory suppression.
Please get a second opinion before you get yourself and your baby into a whole lot of trouble. Your baby deserves to be in your loving arms, being nursed at your breast right after it is born, not being for days or weeks in the NICU, not able to go home with you.