Alright thank you so much. :)
That's a tough question. You may need to consult with your dentist in regards to any risk involved. Also, I would think that the dentist would also wants to consult with your OB/GYN to determine if there is any issues prior to starting treatment.
Nitrous oxide may be usable in your situation. Again, it would be best to discuss the specifics with your treating dentist and OB/GYN.