I work for a large company running a retail store, and I am contracted to work 45 hours a week. The culture of the company is that you work as many hours as you need to as a manager (even though we don't get paid for anything over 45 hours). Recently one of my junior managers was sacked and I have no replacement. As a result I am working over 80 hours a week, including 21 hour shifts (im on my feet all day). My boss knows I am pregnant and hasn't done any kind of risk assessment, but when i mentioned the number of hours to him he responded by talking about my poor performance (he has not mentioned this before), and said he was not prepared to come to my store to help. I don't know how to go about raising it as an issue.. they cant force me to go in to work but I know if the store doesn't open i will be disciplined/ thought of as unreliable. Its making me so miserable but I cant afford to quit, and all i do is argue with my oh about it. I don't want to ruin my personal life or risk my pregnancy for this company but I just don't know how to tell them in the right way.