Im in a lot of pain and doctors office is closed to day can get to dentist until January 24 2014 also am allergic to hydrocoden what should I do?

Call your OB GYN's office in the morning.
Then start calling around to other dentists. You need one. Hydrocodone has no vital bearing on an abscessed tooth. Any dentist knows what can be given in the way of drugs to a pregnant woman, and you can double check with your doctor.