It is ok to do a root canal with a minimum of time. A dentist can do a quick pulpectomy for this time; you can come back after the delivery and finish it. We want you to spend as little time in the dental chair as possible, don't want to give you stress and tiredness the whole procedure.
A root canal during pregnancy is safe and recommended if you're in severe pain. I would advise the consult of the dentist with your OB/GYN just to make sure there aren't any contra-indications. Using the anesthetic during the procedure increases your heart rate slightly, but being in pain every day adds a lot of stress on your body! If you are unable to get the root canal done for whatever reason, make sure that your pain is well managed by prescriptions safe to take while pregnant.
Now to the 6 months. The best time to treat a pregnant woman is in the middle trimester. Ask you ob/gym as well. Do the root canal quickly and you will then need a post and crown where you can do those without anesthesia and therefore no risk to you or the baby.
Call if you need
I hope this helps.
David M. Kaffey, DDS
extraction. Most OB/GYN that I have worked with in this situation recommend using local anesthetic without vasoconstrictor, if an Xray is necessary-use 2 lead aprons, and if pain control after the fact is necessary, then Tylenol (Acetominophen) or Tylenol #3 with codeine can be used. Hope you feel better.