I have a very serious question

I believe I'm high risk because I've had past miscarriages and I want to stay home from work for a little while. I do a lot of lifting even after i told my job I couldn't. I haven't been working here that long and I would love to go back to work after my pregnancy so I don't want to quit. Can I ask for my doctor to put me on bed rest, will she? Or will she not let me if she doesn't find me to be high risk? I'm really nervous!