Sub is not good for babies....biggest issue is that the baby will be born addicted. Other problem is that withdrawls can cause a miscarriage.
My suggestion would be to step up your tapering...being very mindful of withdrawl symptoms...if they get overly severe you should slow down. If you absolutely cannot taper in time...you made need to consider
methadone. Methadone is the standard for pregnant women...and although still addicting to the unborn....has not been found to cause birth defects or other issues.
Take a good multivitamin starting today! This is the easiest thing you can do to avoid birth defects...
Go see an OBgyn asap and explain to him or her your predicament....women get pregnant while on medication all the time.
Since you haven't decided on whether you're going to keep it....consider talking to Planned Parenthood. They can counsel you and don't lean too strongly in either direction (keep or not keep)....whatever you decide they can help you.
I know...they counseled me through my pregnancy and now I have a healthy 5 year old!
Good Luck and let me know....you can also email me anytime:
Ymccormack@alamedanet.net