I am a proud vegan! It sounds like you are doing everything right - and probably more contentious than most pregnant mothers about what you are putting into your body. I tracked my food intake on Live Strong's My Plate website to make sure I am getting enough protein (0.4 grams per pound of weight, and once in your second trimester, add 25 grams and continue with this number until you give birth). Turns out I do just fine with getting enough!
Vitamins - just make sure it is a vegan form of DHA and take whatever standard prenatal vitamins everyone should take. I had my doctor get my B12 levels since I have been vegan for 5 years (much longer vegetarian) and have never taken ANY supplements. Although my doctor didn't feel the need to, I wanted to know in case my MIL challenged me :)
Also, just make sure your orange juice doesn't have D3 (vitamin D make from sheep). I went to have some of my husband's Tropicana and then I realized it wasn't veg :(