If you're worried about not getting enough nutrients (as opposed to just calories) make sure you're taking a pregnancy vitamin supplement... I couldn't keep much food down for 1st trimester so took supplements daily so at least bubs was getting what it needed.
I am having Blackmores Pregnancy and BF Formula, but apparently I still need to have extra calories.

I have had juice this morning and am about to go for a walk. When I get back I'll make my banana and mango smoothie.