Yes. Helps baby not to come into the world with withdrawal symptoms.
Yes. Yes, you can get off opiates. Some experts recommend Methadone but you can be treated wtih subutex. Your baby will be born addicted regardless. You should not try to go cold turkey while pregnant.
Yes. Absolutely, and the sooner the better. Depending on your drug of choice will dictate which treatment options are best for you during your pregnancy. Be honest and up front with your obstetrician about you addiction, and ask for help.