Medical will not cover invisalign unless you can prove that it is a medical necessity which would be very hard to do.Their rules as to coverage are very hard and fast and they view invisalign as cosmetic rather than a necessity for your health and well being. As to having invisalign during your pregnancy, there seems to be no evidence that there would be a medical problem for you or your baby. It may not be the most convenient time for you to do the procedure since it requires a commitment of wearing them pretty much all of the time. Also there will be a few trips to get new aligners from your dentist, and depending how far away he is and how uncomfortable you are at the end of your pregnancy, you might want to wait until after your baby is born...Hope this helps and congratulations and,. no matter what, DO the invislalign and give yourself a gift of straight teeth and a beautiful smile!