Early pregnancy / high stress job

How do you guys handle pregnancy/ working ? I have a very physically demanding job. I’m on my feet all day we are also really short staffed. Ive had some cramping which I’ve told my doctor about and she told me to rest when I need to and listen to my body if I need a break I’ll know pretty much. So , I’ve been trying to take it easy and relax as much as possible when I’m off ..but even on my days off I’m being called and asked to work. I’m not ready to tell anyone yet… thing is the owner of my work called me today and got pretty angry with me on the phone for saying I couldn’t work on my day off. Really stressed me out and I ended up calling the manager crying and told her of my pregnancy when i wasn’t ready to tell anyone ( none of my family knows.. only my sister) I’m just trying to do my best for the baby and myself while trying to also do my best at work. Any suggestions? Should I just come flat out and tell the owner of my work as well? My manager now knows and told me she will keep it between myself and her…