Not Hungry!!

I am around 6 weeks pregnant, I don't feel hungry at all, don't crave for anything to eat, I have actually gone without food and very little to drink in last 24 hours+ and same in last 2-3 weeks, I am usually a foody but don't know why I don't feel hungry,  will that be any problem to my baby? I don't know if I am stressed that's the reason I am not eating? I have never gone without food before. It's worrying me now. Please any advise on this xx