Neon i think if you're still sick/not eating well past the first trimester then it's different but I've also read elsewhere that unless you're seriously malnourished from HG, your baby will still be getting enough nutrition from your body's existing stores for the first few months.
Magic carbs and cheese is all I can cope with at the moment as well! I think they're testing my iron levels as part of my routine bloods, if that's not the same for you then you could always ask your GP if you're concerned?
Super we are so lucky to get it all for free! With all my fertility treatment and now having the baby, I dread to think how much it would all have cost if I'd had to pay for it.