I had my wisdom teeth out about 4 weeks ago, I was 17 weeks pregnant. I was not able to have laughing gas, but I did have numbing needles (just without novacain(sp)) the numbing does wear off and it did hurt a bit, but I made it through! Be tough and know it is ok. My baby is just fine, actually probably better since I no longer have the toothache from my wisdom teeth! Good luck!
You not supposed to get neither while pregnant you should ask your doctor