Anyone else feel like this, whats it mean?

Well im 8weeks pregnant and constantly feel sick (never actually being sick), I get hungry firstly can't think of anything i want to eat usually i like lots of different nice flavoured things, now all i seem to want is boring stuff eg ready salted walkers and tomato's with salt on and bland food, also whenever i get something to eat i eat half and really can't stomach eating anymore. Anyone else experiencing this and also getting a bit worried abut my wanting salty stuff alot.