Should I quit?

I just found out I was pregnant and i am 4 weeks today. I'm supposed to start working for amazon which would require me to work on my feet for around 10 hours. The pay is really good though and me and my fiancé need a high paying job. I was just wondering should I be on my feet that much and do all the bending and walking? My last pregnancy was a miscarriage and I'm scared to have another one. Should I just quit and find another job like my fiancé wants me to do? I was thinking about letting my job know I'm pregnant and if I can take it easy but idk if I would be working as much as everyone else and I have plans when I start getting paid. Please help ☹️