First, tell your doctor. There are databases which tell doctors and women what the relative dangers of different medications are. Your pain doc and your OB should be able to work together with you and decide what to do.

I do not know that there is a lot of info on Neurontin, but I'm sure there is some, as people with epilepsy have babies and must stay on meds. But this is an issue for you and your docs together, as well as whatever prenatal counselling there is at your hospital.