Working while pregnant

So I just started working seasonally at a warehouse. I've worked here before and it's not hard. This time though it's tough now that I'm pregnant. I'm so swollen with an hour of starting work. My feet, ankles and legs are so swollen and sore I can't stand it. I'm worried is it even safe? I've done this before and your feet hurt but nothing like this. I need this job and hubby doesn't get it. Just feeling really nervous and frustrated