I would only ask your OG/GYN and get two or more opinions. No offense to the Grandma who is going to have twins....but if your daughter has not been victim of chronic Pain then you don't know what the hell you are talking about.
Do not let anyone make you feel guilty. If you have a legitimate reason for taking pain meds then that is between you and your doctor. NO DOCTOR would put you or your baby at risk. They are in the business of saving lives....
An alternative is up to you. We don't know your chronic pain situation. I personally have 17 1" screws and 2 five inch titanium plates and an almost no elbow left from a hit and run car accident. I understand Chronic Pain. I'm never going to be the same.
What you might consider is weening to a lower dose, along with meditation, prayer and warm/cold packs. I know that our minds are very powerful tools. There has to be hope...otherwise when my husband and I plan our next child I am completely screwed!
Good Luck Hun