#1: I like both the leggings and the top. The top would look cute with your new skinny jeans and boots too! Synthetic doesn't bother me as long as it feels nice - and it typically has the added bonus of being easy to care for.
#2: I think this dress is great! Love it in the orange, but the blue is pretty too.
#3: Great tunic and I think this is great for your style.
#4/5: Basics that will get a LOT of wear. I like both. You might want to pick up more than one tank if the price is right for your budget. Do you have a Target? They had some decent maternity basics for a good price.
#6: Between this dress and #2, I'd go with #2. Even with a belt I fear #6 will be awfully tent-like and make you feel bigger than you actually are. I'm fairly short, so when I was pregnant, my belly had nowhere to go but straight out - wearing something like this was simply not flattering.
#7/8: Two more great basics. Personally, I like the simpler lines of #8 over #7, but I'm not much of a ruffle girl.
You have such a great sense of style - trust your instincts and you will look fabulous and fashionable. It's been a while now (my little guy is almost 7!!), but my absolute favorite top was a fitted but stretchy black jersey v-neck top. It looked just as great dressed up with dressy pants or dressed down with denim. It was my "go-to" piece when I wasn't feeling great or I felt like it was really important to look particularly pulled together. Other days were simply not my fashionable best and I decided I was going to be okay with that!
Take care of you and that baby - and remember that everything else is just icing on the cake! (easier said than done, admittedly)