Hey. I'm sort of in your situation. I'm 8 weeks and a couple days. The only diff for me is, I DON'T HAVE AN APPETITE! I've actually lost weight since i found out i was pregnant. I have been taking my Pre-Natal's, but i don't feel, that alone, is enough! But i'd say, just as long as your eating the proper foods and taking your vitamins, you'll be fine. I would talk to your Dr. just to give him an update on whats going on. I plan on doing so on my next apt.(3 days from now).
There's also these Candy's that you can buy to help with the morning sickness. They haven't helped me but i know of a few people they've worked on. You can find these candy's in Baby's R' Us and Baby Depot!
Oh and another tip - if you have the urge to vomit... DO SO! That's the only way you'll find some relief! And drink lots of fluids! (Water is the best)
Hope i helped!