I was 8 months pregnant and had a really bad toothache like you are probably having, they did a root canal on it. I was scared but my baby came out fine. They said it's better if you have to have work done to do it in the 2nd vs. 1st or 3rd tri-mester.
The baby will probably be fine and it has to be better than taking all those Tylenol I know they don't work and they don't want you taking Advil. That was so hard on me...
God bless and I pray you feel better soon!
PS - I put off going to the dentist too until I have too