Vitamin E is important for keeping your blood thin and should be taken by pregnant thals. The experience related to me from thal minors who have had successful pregnancies, is that vitamin E and high doses of folate are most important for having a successful pregnancy. As long as you are not on any blood thinning meds, E is safe to take. And yes, you can take vitamin D, as well. As far as the progesterone, it does prepare the uterine wall for the pregnancy. This does make miscarriage less likely, as it makes it easier for the embryo to implant. You may want to consider a natural cream like wild yam cream if you are uncertain about taking the synthetic type.