Doctor phone call

So today I called to set up first appt and my doctor called me back and set up appt for next week. But told me as a precaution they always suggest vaginal rest until appt, and not to lift more than 20 lbs! I work in EMS and lift over 200 lbs multiple times a night. Scares me, if I tell my work I may loose my job. I have never been told no lifting in early pregnancy and the doctor said this is a normalprecaution  has anyone else heard this ?