A girl I used to work with had a pregnancy whilst on methadone. From memory she had been on the methadone program for around 6 months.

She lost the baby at around 17 weeks pregnant. But I don't know if she was fully following the program at that stage, or if she had had a backward slide to using again. (She had been functioning well at work whilst on the methadone program, but then started taking a fair bit of time off when she found out she was pregnant so I knever really knew if she felt ill from the pregnancy or had gone back to her old ways.........)

I never found out the casue of her losing the baby either, but 17 weeks is a late loss, and not that common.