working hrs?

is working 1-10 almost everyday or 8-9 hr shifts everyday okay while being 31 weeks pregnant? or is that considered doing too much at this time? i find myself not being able to bend down & pick stuff up as much anymore it’s really uncomfortable and my feet get swollen but that’s about it so far but by the 6th hr i start to get extremely tired and have to take breaks every 30 minutes to sit down. (which they don’t like)