Having been an HR Director for school districts for 13 years before starting the practice of law, I would still recommend that you not resign until after the baby is born. There is no certainty in the world and you should maintain your job protections, in fact some school districts will allow you to take a full years leave of absence without requiring you to resign. Teaching jobs are hard to come by so preserve your rights to a job as long as possible.
You may want to consult an employment attorney for more specific answers to your questions. You can find one here on Avvo.com or by calling the local bar association.
Best of luck!
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My colleague gave you good advice. It makes sense to take full advantage of your current ability to go back to work should you decide to do so. Take the time to be certain since you have the luxury of doing so. Assuming you have a working spouse it might seem like a good idea to resign and be home with the child. However, from now until the deadline for your final decision, there are a lot of uncertainties. Just be sure of what you want before you do something you might wish to change but cannot.
Good luck and congratulations.
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