Seven weeks pregnant and only able to eat maybe 800 calories a day. mostly fruit and vegetables since im sick. is this ok for first trimester?

Get some help: You need to meet with a clinical dietitian or confer with your OB. The person loosing in this process would be you & maybe baby. The placenta will take from your body/bones/muscles/etc. the nutrients baby needs to grow. I would look to any source of easy but balanced nutrition to maintain your needs at this point. Do not wait for this to get better because it may not.

Agree with Dr. F: Even more than food is the importance of remaining hydrated by drinking water and fruit juice. Wish you good health and a healthy baby!