Seeking Help...
Welcome to BB.....
My sister is a user & was using whilst on methadone as well she has a pill addiction...

Her daughter was born via c/sect & my niece had withdrawals, shaking, fitting , pain & cramping for a few weeks/months...

I would think if you can stay off the gear & anything else other than the methadone (if that helps to keep you clean) & you desperately want the best for your baby then it is a step in the right direction.
I have heard numerous stories about her friends that have not been so lucky with their babies & there have been many sad outcomes, I wont get into it all though...
Obviously it would be best if there were no drugs, chemicals etc passed on to the unborn child, but addictions are not easy to kick!
I wish you luck & I pray that you can stay off it to give your child a great life & future..