Great, I am happy you are looking into all options.
I would think that if you were on an approved maternity leave that you would be fine. If you would actually quit your position with the hopes of finding another position later, then I would not think that would be OK. Also, you could try to time your babies for the summer (I was lucky to be able to do this - I had one in June and one in July) and hope family could help you out with child care.
Currently, I am an elementary principal (K-5) and I have taught first, fifth, sixth, and kindergarten as well as serving as an Instructional Consultant K-12. Education is a very rewarding career but it is also very hard work. I do not know very many teachers who actually take the summer off. Many take classes in the summer or serve on curriculum committees or coach students or write grants. Teachers are amazing! Be prepared to pay for all of your licensing and certification tests. Also, you will, most likely, subsidize your classroom with toys, office supplies, books, and some teaching materials. It is amazing how giving teachers can be. Special Education is in demand but in other areas of education there is a surplus of candidates. I just read through 166 applications for one first grade position. It was heartbreaking. Most of the applications were very good. I wish I had time to interview about
120 of them!
Anyway, I am not sure how bad your lupus is, but, you should be abl to pace yourself in this career. I have RA and lupus and I have teachers with various autoimmune problems and we all support each other. You really have to guard your time and make sure you go to bed early EVERY night.
All my best to you!
Lupus, RA, and (Maybe) Fibromyalgia and LOTS of Medications!