sickness and biscuits!

So my nausea has kicked in and not just in the mornings, sometimes in the afternoon and evenings too. I was up at 4:30 am today feeling sick. Is this normal for 6w6d? Also all I want to eat is biscuits! Digestives and rich teas and hobnobs and chocolate digestives! (I'm from the uk!) when I eat proper food I think I'm hungry while I'm eating then I feel sick when I've finished. Anyone else having similar symptoms so early? Xxx