Congrats on ur pregnancy!!!
Oh I am so clucky and I only had my 3rd baby 9 weeks ago.
I was really sick with my last pregnancy, right from 2 days before I found out I was pregnant(I found out when I was 4 weeks, we were TTC), until about 5 months. So I know how u feel, but I hope you aren't sick for as long as I was!!!
I could barely keep a thing down, but my doc said it was ok because even if u can't keep food down, bub still gets what they need from you. Just remember to keep taking ur vitamins, etc. Not alot helped me, but I tried to eat as healthy as possible(plus it doesn't taste as gross as junk food does when u throw it up! lol). It's ok to give into ur cravings sometimes, just don't pig out!!
As for exercise I walked 30 mins a day, it as all I could manage(if that when I was sick).
In total, I gained 12kg, 4.125kg of that was baby! He was big and healthy and just perfect even though I couldn't eat much!