This is a question for your OB!!
Be aware that regular use of any narcotic medication can cause withdrawl in baby at birth.
Try Tylenol 3 with codeine it's safer than vico den when pregnant
I also have back issues. My doctors (ob, perinatal and pain) told me it was ok but to try to go without if possible. At most I take 1 loritab once or twice a week. It's best with any medication to not take but if you have to try not to take too much.