I.,
If you are having that much pain, there is absolutely NO WAY that you can NOT have this taken care of. Trying to "tough it out" until you deliver your baby is definitely not a very good idea, and not just because you're in pain.
Wisdom teeth can become abscessed very easily, if problems with them aren't tended to, and an untreated abscess may make you very sick, which would definitely NOT be good for you, or the baby!
My advice would be for you to see your obstetrician, and have him refer you to an oral surgeon to have this tended to as soon as possible. If you are having that much pain, then I'm sure that infection is setting in! I'm sure you're not the only person to have this happen when they were pregnant, and there must be something that they can do in order to extract the tooth that is causing this, without causing any harm to the baby!
Good luck, and I hope you get some relief soon, from the pain!
D.