Hi again!
Two years ago, my sister in law flew from Germany to Korea around the same time you are planning to return from France (i.e. around one month before the delivery, in order to deliver in Korea). Since she had a healthy pregnancy, it was not a problem at all for her, so I am hoping you will also be fine. But I think she had some problem because Lufthansa woudn't take her (even with a doctor's letter), but the Korean airline company did. So maybe you should first check with the airline companies.
P.S. Are you French? Well, I am Korean but spent almost half of my life in France.