Sorry kind of long ..

So I'm 36 weeks pregnant and have been experiencing cramps,lower back pain along with bleeding when I wipe and dilated to 1 1/2 since my 34 week appointment. Doctor had already given me a doctors note so I wouldn't work over 25 hours a week since I'm on my feet and constantly moving during my shifts. I work at Costco, however manager hasn't been following the note and is scheduling me 31 hours (we are very short staffed) which completely sucks since it causes me to work harder most of the time. I gave my doctor a call over the weekend and he got back to me today ( he was on vacation) and mentioned putting me on bed rest ( simply taking me off work) on my next appointment which is Wednesday. I have no clue how bed rest works through a job. Ftm .Would I immediately have to stop work that same day or would I need to finish the whole work week? TIA!