@Mldn id carry on some kind of supplementation yeah. Baby will essentially leach, pardon the term, nutrients from your body and leave what's left for you which might not be much. My mum, in her day bless her, didn't know about it and ended up with really bad teeth. Extracted a whole load as all her pregnancies (6) took their toll on her body.
@Mrsrobinsonx yeah im beginning to get a bit constipated. Not sure where are you in terms of nausea but try to eat all your veg and fruit - things like bananas, peanut butter, lots of water and green veg have been working for me so far