Work stress and babies health! Don't know what to do!

Katie • ...
Hi, I'm currently 6weeks 2 days pregnant and am still at work but having been in today I feel that my job is causing me too much stress and that's not good for the baby! Didn't have chance for a break today and felt so faint but i have no idea what to do! 
I live in the uk and don't know what support I could get if I left my job? Worries about starting a new one just feel so confused and worried for my baby!